diff --git a/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedLikeRequest.kt b/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedLikeRequest.kt
new file mode 100644
index 00000000..d3fb5c11
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedLikeRequest.kt
@@ -0,0 +1,9 @@
+package com.texthip.thip.data.model.feed.request
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FeedLikeRequest(
+    @SerialName("type") val type: Boolean
+)
diff --git a/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedSaveRequest.kt b/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedSaveRequest.kt
new file mode 100644
index 00000000..e795813b
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/data/model/feed/request/FeedSaveRequest.kt
@@ -0,0 +1,9 @@
+package com.texthip.thip.data.model.feed.request
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FeedSaveRequest(
+    @SerialName("type") val type: Boolean
+)
diff --git a/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedLikeResponse.kt b/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedLikeResponse.kt
new file mode 100644
index 00000000..d0ac267e
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedLikeResponse.kt
@@ -0,0 +1,10 @@
+package com.texthip.thip.data.model.feed.response
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FeedLikeResponse(
+    @SerialName("feedId") val feedId: Long,
+    @SerialName("isLiked") val isLiked: Boolean
+)
diff --git a/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedSaveResponse.kt b/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedSaveResponse.kt
new file mode 100644
index 00000000..64ba310b
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/data/model/feed/response/FeedSaveResponse.kt
@@ -0,0 +1,10 @@
+package com.texthip.thip.data.model.feed.response
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class FeedSaveResponse(
+    @SerialName("feedId") val feedId: Long,
+    @SerialName("isSaved") val isSaved: Boolean
+)
diff --git a/app/src/main/java/com/texthip/thip/data/repository/FeedRepository.kt b/app/src/main/java/com/texthip/thip/data/repository/FeedRepository.kt
index fc112ef7..70af1774 100644
--- a/app/src/main/java/com/texthip/thip/data/repository/FeedRepository.kt
+++ b/app/src/main/java/com/texthip/thip/data/repository/FeedRepository.kt
@@ -4,14 +4,18 @@ import android.content.Context
 import android.net.Uri
 import com.texthip.thip.data.model.base.handleBaseResponse
 import com.texthip.thip.data.model.feed.request.CreateFeedRequest
+import com.texthip.thip.data.model.feed.request.FeedLikeRequest
+import com.texthip.thip.data.model.feed.request.FeedSaveRequest
 import com.texthip.thip.data.model.feed.request.UpdateFeedRequest
+import com.texthip.thip.data.model.feed.response.AllFeedResponse
 import com.texthip.thip.data.model.feed.response.CreateFeedResponse
 import com.texthip.thip.data.model.feed.response.FeedDetailResponse
-import com.texthip.thip.data.model.feed.response.FeedWriteInfoResponse
+import com.texthip.thip.data.model.feed.response.FeedLikeResponse
 import com.texthip.thip.data.model.feed.response.FeedMineInfoResponse
-import com.texthip.thip.data.model.feed.response.RelatedBooksResponse
-import com.texthip.thip.data.model.feed.response.AllFeedResponse
+import com.texthip.thip.data.model.feed.response.FeedSaveResponse
+import com.texthip.thip.data.model.feed.response.FeedWriteInfoResponse
 import com.texthip.thip.data.model.feed.response.MyFeedResponse
+import com.texthip.thip.data.model.feed.response.RelatedBooksResponse
 import com.texthip.thip.data.service.FeedService
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
@@ -169,7 +173,7 @@ class FeedRepository @Inject constructor(
     }
 
     /** 피드 상세 조회 */
-    suspend fun getFeedDetail(feedId: Int): Result<FeedDetailResponse?> = runCatching {
+    suspend fun getFeedDetail(feedId: Long): Result<FeedDetailResponse?> = runCatching {
         feedService.getFeedDetail(feedId)
             .handleBaseResponse()
             .getOrThrow()
@@ -177,7 +181,7 @@ class FeedRepository @Inject constructor(
 
     /** 피드 수정 */
     suspend fun updateFeed(
-        feedId: Int,
+        feedId: Long,
         contentBody: String? = null,
         isPublic: Boolean? = null,
         tagList: List<String>? = null,
@@ -194,7 +198,6 @@ class FeedRepository @Inject constructor(
             .handleBaseResponse()
             .getOrThrow()
     }
-
     /** 임시 파일들을 정리하는 함수 */
     private fun cleanupTempFiles(tempFiles: List<File>) {
         tempFiles.forEach { file ->
@@ -219,4 +222,27 @@ class FeedRepository @Inject constructor(
             .handleBaseResponse()
             .getOrThrow()
     }
+
+    /** 피드 삭제 */
+    suspend fun deleteFeed(feedId: Long): Result<String?> = runCatching {
+        feedService.deleteFeed(feedId)
+            .handleBaseResponse()
+            .getOrThrow()
+    }
+
+    suspend fun changeFeedLike(feedId: Long, newLikeStatus: Boolean): Result<FeedLikeResponse?> = runCatching {
+        val request = FeedLikeRequest(type = newLikeStatus)
+        feedService.changeFeedLike(feedId, request)
+            .handleBaseResponse()
+            .getOrThrow()
+    }
+
+    /** 피드 저장 */
+    suspend fun changeFeedSave(feedId: Long, newSaveStatus: Boolean): Result<FeedSaveResponse?> = runCatching {
+        val request = FeedSaveRequest(type = newSaveStatus)
+        feedService.changeFeedSave(feedId, request)
+            .handleBaseResponse()
+            .getOrThrow()
+    }
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/data/service/FeedService.kt b/app/src/main/java/com/texthip/thip/data/service/FeedService.kt
index 26aa7fd7..8b93abfe 100644
--- a/app/src/main/java/com/texthip/thip/data/service/FeedService.kt
+++ b/app/src/main/java/com/texthip/thip/data/service/FeedService.kt
@@ -1,19 +1,24 @@
 package com.texthip.thip.data.service
 
 import com.texthip.thip.data.model.base.BaseResponse
+import com.texthip.thip.data.model.feed.request.FeedLikeRequest
+import com.texthip.thip.data.model.feed.request.FeedSaveRequest
+import com.texthip.thip.data.model.feed.request.UpdateFeedRequest
+import com.texthip.thip.data.model.feed.response.AllFeedResponse
 import com.texthip.thip.data.model.feed.response.CreateFeedResponse
 import com.texthip.thip.data.model.feed.response.FeedDetailResponse
+import com.texthip.thip.data.model.feed.response.FeedLikeResponse
+import com.texthip.thip.data.model.feed.response.FeedMineInfoResponse
+import com.texthip.thip.data.model.feed.response.FeedSaveResponse
 import com.texthip.thip.data.model.feed.response.FeedUsersInfoResponse
 import com.texthip.thip.data.model.feed.response.FeedUsersResponse
 import com.texthip.thip.data.model.feed.response.FeedWriteInfoResponse
-import com.texthip.thip.data.model.feed.response.FeedMineInfoResponse
-import com.texthip.thip.data.model.feed.response.RelatedBooksResponse
-import com.texthip.thip.data.model.feed.response.AllFeedResponse
 import com.texthip.thip.data.model.feed.response.MyFeedResponse
-import com.texthip.thip.data.model.feed.request.UpdateFeedRequest
+import com.texthip.thip.data.model.feed.response.RelatedBooksResponse
 import okhttp3.MultipartBody
 import okhttp3.RequestBody
 import retrofit2.http.Body
+import retrofit2.http.DELETE
 import retrofit2.http.GET
 import retrofit2.http.Multipart
 import retrofit2.http.PATCH
@@ -64,7 +69,7 @@ interface FeedService {
     /** 피드 상세 조회 */
     @GET("feeds/{feedId}")
     suspend fun getFeedDetail(
-        @Path("feedId") feedId: Int
+        @Path("feedId") feedId: Long
     ): BaseResponse<FeedDetailResponse>
 
     @GET("feeds/users/{userId}/info")
@@ -77,10 +82,30 @@ interface FeedService {
         @Path("userId") userId: Long
     ): BaseResponse<FeedUsersResponse>
 
+    /** 피드 삭제 */
+    @DELETE("feeds/{feedId}")
+    suspend fun deleteFeed(
+        @Path("feedId") feedId: Long
+    ): BaseResponse<String>
+
+    /** 피드 좋아요 상태 변경 */
+    @POST("feeds/{feedId}/likes")
+    suspend fun changeFeedLike(
+        @Path("feedId") feedId: Long,
+        @Body request: FeedLikeRequest
+    ): BaseResponse<FeedLikeResponse>
+
     /** 피드 수정 */
     @PATCH("feeds/{feedId}")
     suspend fun updateFeed(
-        @Path("feedId") feedId: Int,
+        @Path("feedId") feedId: Long,
         @Body request: UpdateFeedRequest
     ): BaseResponse<CreateFeedResponse>
+
+    /** 피드 저장 상태 변경 */
+    @POST("feeds/{feedId}/saved")
+    suspend fun changeFeedSave(
+        @Path("feedId") feedId: Long,
+        @Body request: FeedSaveRequest
+    ): BaseResponse<FeedSaveResponse>
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/common/buttons/ActionBarButton.kt b/app/src/main/java/com/texthip/thip/ui/common/buttons/ActionBarButton.kt
index 5af726aa..9440c051 100644
--- a/app/src/main/java/com/texthip/thip/ui/common/buttons/ActionBarButton.kt
+++ b/app/src/main/java/com/texthip/thip/ui/common/buttons/ActionBarButton.kt
@@ -30,6 +30,7 @@ fun ActionBarButton(
     isSaveVisible: Boolean = false,
     isSaved: Boolean = false,
     isPinVisible: Boolean = false,
+    isLockIcon: Boolean = false,
     onLikeClick: () -> Unit = {},
     onCommentClick: () -> Unit = {},
     onBookmarkClick: () -> Unit = {},
@@ -88,12 +89,22 @@ fun ActionBarButton(
         }
 
         if (isSaveVisible) {
-            Icon(
-                modifier = Modifier.clickable { onBookmarkClick() },
-                painter = painterResource(if (isSaved) R.drawable.ic_save_filled else R.drawable.ic_save),
-                contentDescription = null,
-                tint = Color.Unspecified
-            )
+            if (isLockIcon) {
+                Icon(
+                    painter = painterResource(R.drawable.ic_lock),
+                    contentDescription = null,
+                    tint = Color.Unspecified
+                )
+            } else {
+                Icon(
+                    modifier = Modifier.clickable { onBookmarkClick() },
+                    painter = painterResource(
+                        if (isSaved) R.drawable.ic_save_filled else R.drawable.ic_save
+                    ),
+                    contentDescription = null,
+                    tint = Color.Unspecified
+                )
+            }
         }
     }
 }
@@ -110,10 +121,11 @@ private fun ActionBarButtonPreview() {
         commentCount = 45,
         isSaveVisible = true,
         isSaved = isSaved,
-        isPinVisible = true,
+        isPinVisible = false,
         onLikeClick = { isLiked = !isLiked },
         onCommentClick = {},
         onBookmarkClick = { isSaved = !isSaved },
-        onPinClick = {}
+        onPinClick = {},
+        isLockIcon = true
     )
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/component/MyFeedCard.kt b/app/src/main/java/com/texthip/thip/ui/feed/component/MyFeedCard.kt
index a000e02a..1f1b46e9 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/component/MyFeedCard.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/component/MyFeedCard.kt
@@ -128,7 +128,7 @@ fun MyFeedCard(
 @Composable
 private fun MyFeedCardPrev() {
     val feed1 = FeedItem(
-        id = 1,
+        id = 1L,
         userProfileImage = "https://example.com/profile1.jpg",
         userName = "user.01",
         userRole = stringResource(R.string.influencer),
@@ -144,7 +144,7 @@ private fun MyFeedCardPrev() {
         imageUrls = emptyList()
     )
     val feed2 = FeedItem(
-        id = 2,
+        id = 2L,
         userProfileImage = "https://example.com/profile2.jpg",
         userName = "user.01",
         userRole = stringResource(R.string.influencer),
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedCommentScreen.kt b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedCommentScreen.kt
index ab0e5498..3a94d614 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedCommentScreen.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedCommentScreen.kt
@@ -38,10 +38,13 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.zIndex
 import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.rememberNavController
 import coil.compose.AsyncImage
 import com.texthip.thip.R
 import com.texthip.thip.ui.common.CommentActionMode
 import com.texthip.thip.ui.common.bottomsheet.MenuBottomSheet
+import com.texthip.thip.ui.common.buttons.ActionBarButton
 import com.texthip.thip.ui.common.buttons.ActionBookButton
 import com.texthip.thip.ui.common.buttons.OptionChipButton
 import com.texthip.thip.ui.common.forms.CommentTextField
@@ -63,8 +66,9 @@ import kotlinx.coroutines.delay
 
 @Composable
 fun FeedCommentScreen(
+    navController: NavHostController,
     modifier: Modifier = Modifier,
-    feedId: Int,
+    feedId: Long,
     onNavigateBack: () -> Unit = {},
     onNavigateToFeedEdit: (Int) -> Unit = {},
     onNavigateToUserProfile: (userId: Long) -> Unit = {},
@@ -74,6 +78,15 @@ fun FeedCommentScreen(
     val feedDetailUiState by feedDetailViewModel.uiState.collectAsState()
     val commentsUiState by commentsViewModel.uiState.collectAsState()
 
+    LaunchedEffect(feedDetailUiState.deleteSuccess) {
+        if (feedDetailUiState.deleteSuccess) {
+            navController.previousBackStackEntry
+                ?.savedStateHandle
+                ?.set("deleted_feed_id", feedId)
+
+            onNavigateBack()
+        }
+    }
     LaunchedEffect(feedId) {
         feedDetailViewModel.loadFeedDetail(feedId)
         commentsViewModel.initialize(postId = feedId.toLong(), postType = "FEED")
@@ -239,7 +252,31 @@ fun FeedCommentScreen(
                                     }
                                 }
                             }
-                            HorizontalDivider(color = colors.DarkGrey03, thickness = 10.dp)
+                          HorizontalDivider(
+                            modifier = Modifier.padding(horizontal = 20.dp, vertical = 16.dp),
+                            color = colors.DarkGrey02, thickness = 1.dp
+                        )
+
+                        ActionBarButton(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(horizontal = 20.dp),
+                            isLiked = feedDetail.isLiked,
+                            likeCount = feedDetail.likeCount,
+                            commentCount = feedDetail.commentCount,
+                            isSaveVisible = true,
+                            isSaved = feedDetail.isSaved,
+                            isPinVisible = false,
+                            onLikeClick = { feedDetailViewModel.changeFeedLike() },
+                            onCommentClick = { /* 스크롤 이동 or 포커스 처리 */ },
+                            onBookmarkClick = { feedDetailViewModel.changeFeedSave() },
+                            onPinClick = { /* TODO: pin 기능 */ }
+                        )
+
+                        HorizontalDivider(
+                            modifier = Modifier.padding(top = 16.dp),
+                            color = colors.DarkGrey03,
+                            thickness = 10.dp
                         }
                     }
                     when {
@@ -349,7 +386,6 @@ fun FeedCommentScreen(
                         .zIndex(2f)
                 )
             }
-        }
 
         if (isBottomSheetVisible) {
             val menuItems = if (feedDetail.isWriter) {
@@ -386,36 +422,31 @@ fun FeedCommentScreen(
                     )
                 )
             }
+        MenuBottomSheet(
+            items = menuItems,
+            onDismiss = { isBottomSheetVisible = false }
+        )
+    }
 
-            MenuBottomSheet(
-                items = menuItems,
-                onDismiss = { isBottomSheetVisible = false }
-            )
-        }
-
-        if (showDialog) {
-            Box(
-                Modifier
-                    .fillMaxSize()
-                    .clickable { showDialog = false }) {
-                Box(Modifier.align(Alignment.Center)) {
-                    DialogPopup(
-                        title = stringResource(R.string.delete_feed_dialog_title),
-                        description = stringResource(R.string.delete_feed_dialog_description),
-                        onConfirm = {
-                            showDialog = false
-                            isBottomSheetVisible = false
-                            // TODO: 피드 삭제 API 호출
-                        },
-                        onCancel = {
-                            showDialog = false
-                            isBottomSheetVisible = false
-                        }
-                    )
-                }
-            }
-        }
-
+    if (showDialog) {
+        Box(
+            Modifier
+                .fillMaxSize()
+                .clickable { showDialog = false }) {
+            Box(Modifier.align(Alignment.Center)) {
+                DialogPopup(
+                    title = stringResource(R.string.delete_feed_dialog_title),
+                    description = stringResource(R.string.delete_feed_dialog_description),
+                    onConfirm = {
+                        showDialog = false
+                        isBottomSheetVisible = false
+                        feedDetailViewModel.deleteFeed(feedId)
+                    },
+                    onCancel = {
+                        showDialog = false
+                        isBottomSheetVisible = false
+                    }
+                )
         LaunchedEffect(showToast) {
             if (showToast) {
                 delay(3000)
@@ -439,6 +470,7 @@ private fun FeedCommentScreenPrev() {
     ThipTheme {
         FeedCommentScreen(
             feedId = 1,
+            navController = rememberNavController()
         )
     }
 }
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedOthersScreen.kt b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedOthersScreen.kt
index 43a67cac..84d14767 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedOthersScreen.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedOthersScreen.kt
@@ -45,14 +45,16 @@ fun FeedOthersScreen(
 
     FeedOthersContent(
         uiState = uiState,
-        onNavigateBack = onNavigateBack
+        onNavigateBack = onNavigateBack,
+        onLikeClick = { feedId -> viewModel.changeFeedLike(feedId) }
     )
 }
 
 @Composable
 fun FeedOthersContent(
     uiState: FeedOthersUiState,
-    onNavigateBack: () -> Unit
+    onNavigateBack: () -> Unit,
+    onLikeClick: (Long) -> Unit
 ) {
     val userInfo = uiState.userInfo
 
@@ -134,7 +136,7 @@ fun FeedOthersContent(
                             Spacer(modifier = Modifier.height(if (index == 0) 20.dp else 40.dp))
                             OthersFeedCard(
                                 feedItem = feed,
-                                onLikeClick = { /* TODO: 좋아요 로직 연결 */ },
+                                onLikeClick = { onLikeClick(feed.feedId) },
                                 onContentClick = { /* TODO: 피드 상세 댓글 화면으로 이동 */ }
                             )
                             Spacer(modifier = Modifier.height(40.dp))
@@ -184,7 +186,8 @@ private fun FeedOthersScreenPrev() {
                 userInfo = mockUserInfo,
                 feeds = mockFeeds
             ),
-            onNavigateBack = {}
+            onNavigateBack = {},
+            onLikeClick = {}
         )
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedScreen.kt b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedScreen.kt
index e1ee0d57..01f71cf4 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedScreen.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedScreen.kt
@@ -1,5 +1,6 @@
 package com.texthip.thip.ui.feed.screen
 
+import android.util.Log
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.core.Animatable
 import androidx.compose.animation.core.LinearEasing
@@ -41,6 +42,8 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.rememberNavController
 import com.texthip.thip.R
 import com.texthip.thip.ui.common.buttons.FloatingButton
 import com.texthip.thip.ui.common.header.AuthorHeader
@@ -65,11 +68,12 @@ import kotlinx.coroutines.launch
 fun FeedScreen(
     onNavigateToMySubscription: () -> Unit = {},
     onNavigateToFeedWrite: () -> Unit = {},
-    onNavigateToFeedComment: (Int) -> Unit = {},
+    onNavigateToFeedComment: (Long) -> Unit = {},
     onNavigateToBookDetail: (String) -> Unit = {},
+    resultFeedId: Long? = null,
     onNavigateToUserProfile: (userId: Long) -> Unit = {},
-    resultFeedId: Int? = null,
     onResultConsumed: () -> Unit = {},
+    navController: NavHostController,
     feedViewModel: FeedViewModel = hiltViewModel(),
 ) {
     val feedUiState by feedViewModel.uiState.collectAsState()
@@ -96,6 +100,16 @@ fun FeedScreen(
                     lastVisibleIndex >= totalItems - 3
         }
     }
+    LaunchedEffect(Unit) {
+        navController.currentBackStackEntry?.savedStateHandle?.let { handle ->
+            handle.getLiveData<Long>("deleted_feed_id").observeForever { deletedId ->
+                if (deletedId != null) {
+                    feedViewModel.removeDeletedFeed(deletedId)
+                    handle.remove<Long>("deleted_feed_id")
+                }
+            }
+        }
+    }
 
     LaunchedEffect(shouldLoadMore) {
         if (shouldLoadMore) {
@@ -210,7 +224,7 @@ fun FeedScreen(
                         // 내 피드
                         item {
                             Spacer(modifier = Modifier.height(32.dp))
-                            
+
                             val myFeedInfo = feedUiState.myFeedInfo
                             AuthorHeader(
                                 profileImage = myFeedInfo?.profileImageUrl,
@@ -265,7 +279,7 @@ fun FeedScreen(
 
                                 // MyFeedItem을 FeedItem으로 변환
                                 val feedItem = FeedItem(
-                                    id = myFeed.feedId,
+                                    id = myFeed.feedId.toLong(),
                                     userProfileImage = null,
                                     userName = "", // 내 피드이므로 고정값
                                     userRole = "", // 내 피드이므로 고정값
@@ -314,7 +328,7 @@ fun FeedScreen(
                         itemsIndexed(feedUiState.allFeeds, key = { _, item -> item.feedId }) { index, allFeed ->
                             // AllFeedItem을 FeedItem으로 변환
                             val feedItem = FeedItem(
-                                id = allFeed.feedId,
+                                id = allFeed.feedId.toLong(),
                                 userProfileImage = allFeed.creatorProfileImageUrl,
                                 userName = allFeed.creatorNickname,
                                 userRole = allFeed.aliasName,
@@ -337,10 +351,10 @@ fun FeedScreen(
                                 feedItem = feedItem,
                                 bottomTextColor = hexToColor(allFeed.aliasColor),
                                 onBookmarkClick = {
-                                    // TODO: API 호출로 북마크 상태 변경
+                                    feedViewModel.changeFeedSave(feedItem.id)
                                 },
                                 onLikeClick = {
-                                    // TODO: API 호출로 좋아요 상태 변경
+                                    feedViewModel.changeFeedLike(feedItem.id)
                                 },
                                 onContentClick = {
                                     onNavigateToFeedComment(feedItem.id)
@@ -396,7 +410,8 @@ private fun FeedScreenPreview() {
     ThipTheme {
         FeedScreen(
             onNavigateToFeedWrite = { },
-            onNavigateToBookDetail = { }
+            onNavigateToBookDetail = { },
+            navController = rememberNavController()
         )
     }
 }
@@ -407,7 +422,8 @@ private fun FeedScreenWithoutDataPreview() {
     ThipTheme {
         FeedScreen(
             onNavigateToFeedWrite = { },
-            onNavigateToBookDetail = { }
+            onNavigateToBookDetail = { },
+            navController = rememberNavController()
         )
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedWriteScreen.kt b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedWriteScreen.kt
index 2f485e1b..c4923e47 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedWriteScreen.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/screen/FeedWriteScreen.kt
@@ -62,7 +62,7 @@ import com.texthip.thip.ui.theme.ThipTheme.typography
 fun FeedWriteScreen(
     modifier: Modifier = Modifier,
     onNavigateBack: () -> Unit,
-    onFeedCreated: (Int) -> Unit = {},
+    onFeedCreated: (Long) -> Unit = {},
     viewModel: FeedWriteViewModel = hiltViewModel()
 ) {
     val uiState by viewModel.uiState.collectAsState()
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedLikeUseCase.kt b/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedLikeUseCase.kt
new file mode 100644
index 00000000..4782c16a
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedLikeUseCase.kt
@@ -0,0 +1,11 @@
+package com.texthip.thip.ui.feed.usecase
+
+import com.texthip.thip.data.repository.FeedRepository
+import javax.inject.Inject
+
+class ChangeFeedLikeUseCase @Inject constructor(
+    private val feedRepository: FeedRepository
+) {
+    suspend operator fun invoke(feedId: Long, newLikeStatus: Boolean) =
+        feedRepository.changeFeedLike(feedId, newLikeStatus)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedSaveUseCase.kt b/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedSaveUseCase.kt
new file mode 100644
index 00000000..d59c1106
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/ui/feed/usecase/ChangeFeedSaveUseCase.kt
@@ -0,0 +1,11 @@
+package com.texthip.thip.ui.feed.usecase
+
+import com.texthip.thip.data.repository.FeedRepository
+import javax.inject.Inject
+
+class ChangeFeedSaveUseCase @Inject constructor(
+    private val feedRepository: FeedRepository
+) {
+    suspend operator fun invoke(feedId: Long, newSaveStatus: Boolean) =
+        feedRepository.changeFeedSave(feedId, newSaveStatus)
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/usecase/DeleteFeedUseCase.kt b/app/src/main/java/com/texthip/thip/ui/feed/usecase/DeleteFeedUseCase.kt
new file mode 100644
index 00000000..d8f30be6
--- /dev/null
+++ b/app/src/main/java/com/texthip/thip/ui/feed/usecase/DeleteFeedUseCase.kt
@@ -0,0 +1,13 @@
+package com.texthip.thip.ui.feed.usecase
+
+import com.texthip.thip.data.repository.FeedRepository
+import javax.inject.Inject
+
+//피드 삭제 기능만 담당하는 usecase
+class DeleteFeedUseCase @Inject constructor(
+    private val feedRepository: FeedRepository
+) {
+    suspend operator fun invoke(feedId: Long): Result<String?> {
+        return feedRepository.deleteFeed(feedId)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedDetailViewModel.kt b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedDetailViewModel.kt
index 204d3604..e2543135 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedDetailViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedDetailViewModel.kt
@@ -4,6 +4,9 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.texthip.thip.data.model.feed.response.FeedDetailResponse
 import com.texthip.thip.data.repository.FeedRepository
+import com.texthip.thip.ui.feed.usecase.ChangeFeedLikeUseCase
+import com.texthip.thip.ui.feed.usecase.ChangeFeedSaveUseCase
+import com.texthip.thip.ui.feed.usecase.DeleteFeedUseCase
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -14,12 +17,17 @@ import javax.inject.Inject
 data class FeedDetailUiState(
     val isLoading: Boolean = false,
     val feedDetail: FeedDetailResponse? = null,
-    val error: String? = null
+    val error: String? = null,
+    val isDeleting: Boolean = false,
+    val deleteSuccess: Boolean = false
 )
 
 @HiltViewModel
 class FeedDetailViewModel @Inject constructor(
-    private val feedRepository: FeedRepository
+    private val feedRepository: FeedRepository,
+    private val deleteFeedUseCase: DeleteFeedUseCase,
+    private val changeFeedLikeUseCase: ChangeFeedLikeUseCase,
+    private val changeFeedSaveUseCase: ChangeFeedSaveUseCase
 ) : ViewModel() {
 
     private val _uiState = MutableStateFlow(FeedDetailUiState())
@@ -29,7 +37,7 @@ class FeedDetailViewModel @Inject constructor(
         _uiState.value = update(_uiState.value)
     }
 
-    fun loadFeedDetail(feedId: Int) {
+    fun loadFeedDetail(feedId: Long) {
         viewModelScope.launch {
             updateState { it.copy(isLoading = true, error = null) }
 
@@ -54,6 +62,58 @@ class FeedDetailViewModel @Inject constructor(
                 }
         }
     }
+    fun deleteFeed(feedId: Long) {
+        viewModelScope.launch {
+            updateState { it.copy(isDeleting = true, error = null) }
+
+            deleteFeedUseCase(feedId) // UseCase 호출
+                .onSuccess {
+                    updateState { it.copy(isDeleting = false, deleteSuccess = true) }
+                }
+                .onFailure { exception ->
+                    updateState {
+                        it.copy(
+                            isDeleting = false,
+                            error = exception.message ?: "피드 삭제 중 오류가 발생했습니다."
+                        )
+                    }
+                }
+        }
+    }
+    fun changeFeedLike() {
+        viewModelScope.launch {
+            val originalFeed = _uiState.value.feedDetail ?: return@launch
+
+            val updatedFeed = originalFeed.copy(
+                isLiked = !originalFeed.isLiked,
+                likeCount = if (originalFeed.isLiked) originalFeed.likeCount - 1 else originalFeed.likeCount + 1
+            )
+            updateState { it.copy(feedDetail = updatedFeed) }
+
+            val newLikeStatus = !originalFeed.isLiked
+            changeFeedLikeUseCase(originalFeed.feedId.toLong(), newLikeStatus)
+                .onFailure {
+                    updateState { it.copy(feedDetail = originalFeed) }
+                }
+        }
+    }
+
+    fun changeFeedSave() {
+        viewModelScope.launch {
+            val originalFeed = _uiState.value.feedDetail ?: return@launch
+
+            val updatedFeed = originalFeed.copy(
+                isSaved = !originalFeed.isSaved
+            )
+            updateState { it.copy(feedDetail = updatedFeed) }
+
+            val newSaveStatus = !originalFeed.isSaved
+            changeFeedSaveUseCase(originalFeed.feedId.toLong(), newSaveStatus)
+                .onFailure {
+                    updateState { it.copy(feedDetail = originalFeed) }
+                }
+        }
+    }
 
     fun clearError() {
         updateState { it.copy(error = null) }
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedOthersViewModel.kt b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedOthersViewModel.kt
index f8b4fd66..26fbcb41 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedOthersViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedOthersViewModel.kt
@@ -7,6 +7,7 @@ import androidx.lifecycle.viewModelScope
 import com.texthip.thip.data.model.feed.response.FeedList
 import com.texthip.thip.data.model.feed.response.FeedUsersInfoResponse
 import com.texthip.thip.data.repository.FeedRepository
+import com.texthip.thip.ui.feed.usecase.ChangeFeedLikeUseCase
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.async
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -25,9 +26,9 @@ data class FeedOthersUiState(
 @HiltViewModel
 class FeedOthersViewModel @Inject constructor(
     private val feedRepository: FeedRepository,
+    private val changeFeedLikeUseCase: ChangeFeedLikeUseCase,
     savedStateHandle: SavedStateHandle
 ) : ViewModel() {
-
     private val userId: Long = requireNotNull(savedStateHandle["userId"])
 
     private val _uiState = MutableStateFlow(FeedOthersUiState())
@@ -64,4 +65,31 @@ class FeedOthersViewModel @Inject constructor(
             }
         }
     }
+
+    fun changeFeedLike(feedId: Long) {
+        viewModelScope.launch {
+            val currentFeeds = _uiState.value.feeds
+            val feedToUpdate = currentFeeds.find { it.feedId == feedId } ?: return@launch
+
+            //ui 먼저 변경 ( 낙관적 업데이트 )
+            val newFeeds = currentFeeds.map {
+                if (it.feedId == feedId) {
+                    it.copy(
+                        isLiked = !it.isLiked,
+                        likeCount = if (it.isLiked) it.likeCount - 1 else it.likeCount + 1
+                    )
+                } else {
+                    it
+                }
+            }
+            _uiState.update { it.copy(feeds = newFeeds) }
+
+            //api 호출
+            val newLikeStatus = !feedToUpdate.isLiked
+            changeFeedLikeUseCase(feedId, newLikeStatus)
+                .onFailure {
+                    _uiState.update { it.copy(feeds = currentFeeds) }
+                }
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedViewModel.kt b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedViewModel.kt
index 0e7d0d1d..c158b0d3 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedViewModel.kt
@@ -8,9 +8,12 @@ import com.texthip.thip.data.model.feed.response.MyFeedItem
 import com.texthip.thip.data.model.users.response.RecentWriterList
 import com.texthip.thip.data.repository.FeedRepository
 import com.texthip.thip.data.repository.UserRepository
+import com.texthip.thip.ui.feed.usecase.ChangeFeedLikeUseCase
+import com.texthip.thip.ui.feed.usecase.ChangeFeedSaveUseCase
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -46,7 +49,9 @@ data class FeedUiState(
 @HiltViewModel
 class FeedViewModel @Inject constructor(
     private val feedRepository: FeedRepository,
-    private val userRepository: UserRepository
+    private val userRepository: UserRepository,
+    private val changeFeedLikeUseCase: ChangeFeedLikeUseCase,
+    private val changeFeedSaveUseCase: ChangeFeedSaveUseCase
 ) : ViewModel() {
 
     private val _uiState = MutableStateFlow(FeedUiState())
@@ -305,4 +310,66 @@ class FeedViewModel @Inject constructor(
                 }
         }
     }
+
+    fun changeFeedLike(feedId: Long) {
+        viewModelScope.launch {
+            val currentFeeds = _uiState.value.allFeeds
+            val feedToUpdate = currentFeeds.find { it.feedId.toLong() == feedId } ?: return@launch
+
+            //ui 먼저 변경 ( 낙관적 업데이트 )
+            val newFeeds = currentFeeds.map {
+                if (it.feedId.toLong() == feedId) {
+                    it.copy(
+                        isLiked = !it.isLiked,
+                        likeCount = if (it.isLiked) it.likeCount - 1 else it.likeCount + 1
+                    )
+                } else {
+                    it
+                }
+            }
+            _uiState.update { it.copy(allFeeds = newFeeds) }
+
+            //api 호출
+            val newLikeStatus = !feedToUpdate.isLiked
+            changeFeedLikeUseCase(feedId, newLikeStatus)
+                .onFailure {
+                    _uiState.update { it.copy(allFeeds = currentFeeds) }
+                }
+        }
+    }
+
+    fun changeFeedSave(feedId: Long) {
+        viewModelScope.launch {
+            val currentFeeds = _uiState.value.allFeeds
+            val feedToUpdate = currentFeeds.find { it.feedId.toLong() == feedId } ?: return@launch
+
+            // (낙관적 업데이트) UI 즉시 변경
+            val newFeeds = currentFeeds.map {
+                if (it.feedId.toLong() == feedId) {
+                    it.copy(isSaved = !it.isSaved) // isSaved 상태 반전
+                } else {
+                    it
+                }
+            }
+            updateState { it.copy(allFeeds = newFeeds) }
+
+            // API 호출
+            val newSaveStatus = !feedToUpdate.isSaved
+            changeFeedSaveUseCase(feedId, newSaveStatus)
+                .onFailure {
+                    updateState { it.copy(allFeeds = currentFeeds) }
+                }
+        }
+    }
+    fun removeDeletedFeed(feedId: Long) {
+        val currentAllFeeds = _uiState.value.allFeeds.filterNot { it.feedId.toLong() == feedId }
+        val currentMyFeeds = _uiState.value.myFeeds.filterNot { it.feedId.toLong() == feedId }
+
+        updateState {
+            it.copy(
+                allFeeds = currentAllFeeds,
+                myFeeds = currentMyFeeds
+            )
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteUiState.kt b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteUiState.kt
index 65780274..97bb7041 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteUiState.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteUiState.kt
@@ -24,7 +24,7 @@ data class FeedWriteUiState(
     val isBookPreselected: Boolean = false,
     val isLoadingCategories: Boolean = false,
     val isEditMode: Boolean = false,
-    val editingFeedId: Int? = null
+    val editingFeedId: Long? = null
 ) {
     // 유효성 검사 로직
     val isContentValid: Boolean
diff --git a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteViewModel.kt b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteViewModel.kt
index fa262004..0b4cb315 100644
--- a/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/feed/viewmodel/FeedWriteViewModel.kt
@@ -18,6 +18,7 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 import javax.inject.Inject
+import kotlin.onFailure
 
 @HiltViewModel
 class FeedWriteViewModel @Inject constructor(
@@ -61,7 +62,7 @@ class FeedWriteViewModel @Inject constructor(
         }
     }
 
-    fun loadFeedForEdit(feedId: Int) {
+    fun loadFeedForEdit(feedId: Long) {
         viewModelScope.launch {
             updateState { it.copy(isLoading = true) }
 
@@ -117,7 +118,7 @@ class FeedWriteViewModel @Inject constructor(
     }
 
     fun setEditData(
-        feedId: Int,
+        feedId: Long,
         isbn: String,
         bookTitle: String,
         bookAuthor: String,
@@ -352,7 +353,7 @@ class FeedWriteViewModel @Inject constructor(
         }
     }
 
-    fun createOrUpdateFeed(onSuccess: (Int) -> Unit, onError: (String) -> Unit) {
+    fun createOrUpdateFeed(onSuccess: (Long) -> Unit, onError: (String) -> Unit) {
         val currentState = _uiState.value
 
         if (currentState.isEditMode && currentState.editingFeedId != null) {
@@ -362,7 +363,7 @@ class FeedWriteViewModel @Inject constructor(
         }
     }
 
-    fun createFeed(onSuccess: (Int) -> Unit, onError: (String) -> Unit) {
+    fun createFeed(onSuccess: (Long) -> Unit, onError: (String) -> Unit) {
         val currentState = _uiState.value
 
         if (!currentState.isFormValid) {
@@ -391,7 +392,7 @@ class FeedWriteViewModel @Inject constructor(
                 result.onSuccess { response ->
                     val feedId = response?.feedId
                     if (feedId != null) {
-                        onSuccess(feedId)
+                        onSuccess(feedId.toLong())
                     } else {
                         onError(stringResourceProvider.getString(R.string.error_feed_id_not_returned))
                     }
@@ -415,7 +416,7 @@ class FeedWriteViewModel @Inject constructor(
         }
     }
 
-    private fun updateFeed(feedId: Int, onSuccess: (Int) -> Unit, onError: (String) -> Unit) {
+    private fun updateFeed(feedId: Long, onSuccess: (Long) -> Unit, onError: (String) -> Unit) {
         val currentState = _uiState.value
 
         if (!currentState.isFormValid) {
@@ -437,7 +438,7 @@ class FeedWriteViewModel @Inject constructor(
 
                 result.onSuccess { response ->
                     val updatedFeedId = response?.feedId ?: feedId
-                    onSuccess(updatedFeedId)
+                    onSuccess(updatedFeedId.toLong())
                 }.onFailure { exception ->
                     onError(
                         exception.message
diff --git a/app/src/main/java/com/texthip/thip/ui/mypage/component/SavedFeedCard.kt b/app/src/main/java/com/texthip/thip/ui/mypage/component/SavedFeedCard.kt
index ac5d937f..232eb249 100644
--- a/app/src/main/java/com/texthip/thip/ui/mypage/component/SavedFeedCard.kt
+++ b/app/src/main/java/com/texthip/thip/ui/mypage/component/SavedFeedCard.kt
@@ -111,6 +111,7 @@ fun SavedFeedCard(
             commentCount = feedItem.commentCount,
             isSaveVisible = true,
             isSaved = feedItem.isSaved,
+            isLockIcon = feedItem.isLocked,
             onLikeClick = onLikeClick,
             onCommentClick = onCommentClick,
             onBookmarkClick = onBookmarkClick
@@ -122,7 +123,7 @@ fun SavedFeedCard(
 @Composable
 private fun SavedFeedCardPrev() {
     val feed1 = FeedItem(
-        id = 1,
+        id = 1L,
         userProfileImage = "https://example.com/profile1.jpg",
         userName = "user.01",
         userRole = stringResource(R.string.influencer),
@@ -138,7 +139,7 @@ private fun SavedFeedCardPrev() {
     )
 
     val feed2 = FeedItem(
-        id = 2,
+        id = 2L,
         userProfileImage = "https://example.com/profile2.jpg",
         userName = "user.01",
         userRole = stringResource(R.string.influencer),
diff --git a/app/src/main/java/com/texthip/thip/ui/mypage/mock/FeedItem.kt b/app/src/main/java/com/texthip/thip/ui/mypage/mock/FeedItem.kt
index 32c75942..0b28b534 100644
--- a/app/src/main/java/com/texthip/thip/ui/mypage/mock/FeedItem.kt
+++ b/app/src/main/java/com/texthip/thip/ui/mypage/mock/FeedItem.kt
@@ -1,7 +1,7 @@
 package com.texthip.thip.ui.mypage.mock
 
 data class FeedItem(
-    val id: Int,
+    val id: Long,
     val userProfileImage: String? = null,
     val userName: String,
     val userRole: String,
diff --git a/app/src/main/java/com/texthip/thip/ui/mypage/viewmodel/SavedFeedViewModel.kt b/app/src/main/java/com/texthip/thip/ui/mypage/viewmodel/SavedFeedViewModel.kt
index 7cb2229c..f5f1af2b 100644
--- a/app/src/main/java/com/texthip/thip/ui/mypage/viewmodel/SavedFeedViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/mypage/viewmodel/SavedFeedViewModel.kt
@@ -10,7 +10,7 @@ open class SavedFeedViewModel: ViewModel() {
     private val _feeds = MutableStateFlow(
         listOf(
             FeedItem(
-                id = 1,
+                id = 1L,
                 userProfileImage = "https://example.com/profile.jpg",
                 userName = "user",
                 userRole = "학생",
@@ -24,7 +24,7 @@ open class SavedFeedViewModel: ViewModel() {
                 isSaved = true
             ),
             FeedItem(
-                id = 2,
+                id = 2L,
                 userProfileImage = "https://example.com/profile.jpg",
                 userName = "user",
                 userRole = "학생",
@@ -39,7 +39,7 @@ open class SavedFeedViewModel: ViewModel() {
                 imageUrls = emptyList()
             ),
             FeedItem(
-                id = 3,
+                id = 3L,
                 userProfileImage = "https://example.com/profile.jpg",
                 userName = "user",
                 userRole = "학생",
@@ -54,7 +54,7 @@ open class SavedFeedViewModel: ViewModel() {
                 imageUrls = listOf("https://example.com/image.jpg")
             ),
             FeedItem(
-                id = 4,
+                id = 4L,
                 userProfileImage = "https://example.com/profile.jpg",
                 userName = "user",
                 userRole = "학생",
@@ -69,7 +69,7 @@ open class SavedFeedViewModel: ViewModel() {
                 imageUrls = listOf("https://example.com/image.jpg")
             ),
             FeedItem(
-                id = 5,
+                id = 5L,
                 userProfileImage = "https://example.com/profile.jpg",
                 userName = "user",
                 userRole = "학생",
@@ -90,13 +90,13 @@ open class SavedFeedViewModel: ViewModel() {
 
     open val feeds: StateFlow<List<FeedItem>> = _feeds
 
-    fun toggleBookmark(id: Int) {
+    fun toggleBookmark(id: Long) {
         _feeds.value = _feeds.value.map {
             if (it.id == id) it.copy(isSaved = !it.isSaved) else it
         }
     }
 
-    fun toggleLike(id: Int) {
+    fun toggleLike(id: Long) {
         _feeds.value = _feeds.value.map {
             if (it.id == id) it.copy(isLiked = !it.isLiked) else it
         }
diff --git a/app/src/main/java/com/texthip/thip/ui/navigator/extensions/FeedNavigationExtensions.kt b/app/src/main/java/com/texthip/thip/ui/navigator/extensions/FeedNavigationExtensions.kt
index 85c3cff7..88f892c1 100644
--- a/app/src/main/java/com/texthip/thip/ui/navigator/extensions/FeedNavigationExtensions.kt
+++ b/app/src/main/java/com/texthip/thip/ui/navigator/extensions/FeedNavigationExtensions.kt
@@ -20,7 +20,7 @@ fun NavHostController.navigateToFeedWrite() {
 }
 
 // 피드 댓글으로
-fun NavHostController.navigateToFeedComment(feedId: Int) {
+fun NavHostController.navigateToFeedComment(feedId: Long) {
     navigate(FeedRoutes.Comment(feedId))
 }
 
diff --git a/app/src/main/java/com/texthip/thip/ui/navigator/navigations/FeedNavigation.kt b/app/src/main/java/com/texthip/thip/ui/navigator/navigations/FeedNavigation.kt
index 906166ca..df3bd6c2 100644
--- a/app/src/main/java/com/texthip/thip/ui/navigator/navigations/FeedNavigation.kt
+++ b/app/src/main/java/com/texthip/thip/ui/navigator/navigations/FeedNavigation.kt
@@ -23,12 +23,13 @@ import com.texthip.thip.ui.navigator.routes.MainTabRoutes
 // Feed
 fun NavGraphBuilder.feedNavigation(navController: NavHostController, navigateBack: () -> Unit) {
     composable<MainTabRoutes.Feed> { backStackEntry ->
-        val resultFeedId = backStackEntry.savedStateHandle.get<Int>("feedId")
+        val resultFeedId = backStackEntry.savedStateHandle.get<Long>("feedId")
 
         FeedScreen(
+            navController = navController,
             resultFeedId = resultFeedId,
             onResultConsumed = {
-                backStackEntry.savedStateHandle.remove<Int>("feedId")
+                backStackEntry.savedStateHandle.remove<Long>("feedId")
             },
             onNavigateToMySubscription = {
                 navController.navigateToMySubscription()
@@ -70,7 +71,7 @@ fun NavGraphBuilder.feedNavigation(navController: NavHostController, navigateBac
                 route.bookAuthor != null
             ) {
                 viewModel.setEditData(
-                    feedId = route.feedId,
+                    feedId = route.feedId.toLong(),
                     isbn = route.isbn,
                     bookTitle = route.bookTitle,
                     bookAuthor = route.bookAuthor,
@@ -81,7 +82,7 @@ fun NavGraphBuilder.feedNavigation(navController: NavHostController, navigateBac
                 )
             } else if (route.feedId != null) {
                 // 수정 모드: 기존 방식 (API 호출)
-                viewModel.loadFeedForEdit(route.feedId)
+                viewModel.loadFeedForEdit(route.feedId.toLong())
             } else if (route.isbn != null &&
                 route.bookTitle != null &&
                 route.bookAuthor != null &&
@@ -119,12 +120,14 @@ fun NavGraphBuilder.feedNavigation(navController: NavHostController, navigateBac
         )
     }
     composable<FeedRoutes.Comment> { backStackEntry ->
-        val route = backStackEntry.arguments?.let {
-            FeedRoutes.Comment(it.getInt("feedId"))
-        } ?: return@composable
+        /*val route = backStackEntry.arguments?.let {
+            FeedRoutes.Comment(it.getLong("feedId"))
+        } ?: return@composable*/
+        val route = backStackEntry.toRoute<FeedRoutes.Comment>()
 
         FeedCommentScreen(
             feedId = route.feedId,
+            navController = navController,
             onNavigateBack = {
                 navController.popBackStack()
             },
diff --git a/app/src/main/java/com/texthip/thip/ui/navigator/routes/FeedRoutes.kt b/app/src/main/java/com/texthip/thip/ui/navigator/routes/FeedRoutes.kt
index e70faa67..fd9037f5 100644
--- a/app/src/main/java/com/texthip/thip/ui/navigator/routes/FeedRoutes.kt
+++ b/app/src/main/java/com/texthip/thip/ui/navigator/routes/FeedRoutes.kt
@@ -7,7 +7,7 @@ sealed class FeedRoutes : Routes() {
   
     @Serializable data object MySubscription : FeedRoutes()
     
-    @Serializable data class Comment(val feedId: Int) : FeedRoutes()
+    @Serializable data class Comment(val feedId: Long) : FeedRoutes()
 
     @Serializable
     data class Write(
diff --git a/app/src/main/java/com/texthip/thip/ui/search/screen/SearchBookDetailScreen.kt b/app/src/main/java/com/texthip/thip/ui/search/screen/SearchBookDetailScreen.kt
index 2ea2b17e..41c14c10 100644
--- a/app/src/main/java/com/texthip/thip/ui/search/screen/SearchBookDetailScreen.kt
+++ b/app/src/main/java/com/texthip/thip/ui/search/screen/SearchBookDetailScreen.kt
@@ -73,7 +73,7 @@ fun SearchBookDetailScreen(
     onRightClick: () -> Unit = {},
     onRecruitingGroupClick: () -> Unit = {},
     onWriteFeedClick: () -> Unit = {},
-    onFeedClick: (Int) -> Unit = {},
+    onFeedClick: (Long) -> Unit = {},
     onBookmarkClick: (String, Boolean) -> Unit = { _, _ -> },
     viewModel: BookDetailViewModel = hiltViewModel()
 ) {
@@ -120,7 +120,7 @@ private fun SearchBookDetailScreenContent(
     onRightClick: () -> Unit = {},
     onRecruitingGroupClick: () -> Unit = {},
     onWriteFeedClick: () -> Unit = {},
-    onFeedClick: (Int) -> Unit = {},
+    onFeedClick: (Long) -> Unit = {},
     onBookmarkClick: (String, Boolean) -> Unit = { _, _ -> },
     onSortChange: (String) -> Unit = {},
     onLoadMore: () -> Unit = {}
diff --git a/app/src/main/java/com/texthip/thip/ui/search/viewmodel/BookDetailViewModel.kt b/app/src/main/java/com/texthip/thip/ui/search/viewmodel/BookDetailViewModel.kt
index f1c2235c..9984747c 100644
--- a/app/src/main/java/com/texthip/thip/ui/search/viewmodel/BookDetailViewModel.kt
+++ b/app/src/main/java/com/texthip/thip/ui/search/viewmodel/BookDetailViewModel.kt
@@ -178,7 +178,7 @@ class BookDetailViewModel @Inject constructor(
 // RelatedFeedItem을 FeedItem으로 변환하는 확장 함수
 private fun RelatedFeedItem.toFeedItem(): FeedItem {
     return FeedItem(
-        id = this.feedId,
+        id = this.feedId.toLong(),
         userProfileImage = this.creatorProfileImageUrl,
         userName = this.creatorNickname,
         userRole = this.aliasName,