diff --git a/src/main/java/com/codiary/backend/domain/alert/service/AlertService.java b/src/main/java/com/codiary/backend/domain/alert/service/AlertService.java
index 4af8d5f..6a86ae3 100644
--- a/src/main/java/com/codiary/backend/domain/alert/service/AlertService.java
+++ b/src/main/java/com/codiary/backend/domain/alert/service/AlertService.java
@@ -351,7 +351,7 @@ private void sendMemberNewPostAlert(Post post) {
         // 이벤트 저장
         AlertEvent event = saveEvent(
                 EventCategory.FOLLOWING_MEMBER_NEW_POST,
-                PostConverter.toSimplePostResponseDto(post),
+                PostConverter.toPostPreviewDTO(post),
                 receiverIdList
         );
 
@@ -383,7 +383,7 @@ private void sendTeamNewPostAlertToTeamFollowers(Post post) {
         // 이벤트 저장
         AlertEvent event = saveEvent(
                 EventCategory.FOLLOWING_TEAM_NEW_POST,
-                PostConverter.toSimplePostResponseDto(post),
+                PostConverter.toPostPreviewDTO(post),
                 receiverIdList
         );
 
@@ -415,7 +415,7 @@ private void sendTeamNewPostAlertToTeamMembers(Post post) {
         // 이벤트 저장
         AlertEvent event = saveEvent(
                 EventCategory.MY_TEAM_NEW_POST,
-                PostConverter.toSimplePostResponseDto(post),
+                PostConverter.toPostPreviewDTO(post),
                 receiverIdList
         );
 
diff --git a/src/main/java/com/codiary/backend/domain/post/controller/PostController.java b/src/main/java/com/codiary/backend/domain/post/controller/PostController.java
index 6aac8b2..592363e 100644
--- a/src/main/java/com/codiary/backend/domain/post/controller/PostController.java
+++ b/src/main/java/com/codiary/backend/domain/post/controller/PostController.java
@@ -1,7 +1,6 @@
 package com.codiary.backend.domain.post.controller;
 
 import com.codiary.backend.domain.alert.service.AlertService;
-import com.codiary.backend.domain.category.dto.CategoryResponseDTO;
 import com.codiary.backend.domain.member.entity.Member;
 import com.codiary.backend.domain.member.security.CustomMemberDetails;
 import com.codiary.backend.domain.member.service.MemberCommandService;
@@ -20,7 +19,6 @@
 import com.codiary.backend.global.apiPayload.exception.GeneralException;
 import com.codiary.backend.global.jwt.JwtTokenProvider;
 import io.swagger.v3.oas.annotations.Operation;
-import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.constraints.Max;
 import jakarta.validation.constraints.Min;
@@ -103,9 +101,12 @@ public ApiResponse<?> deletePost(@PathVariable Long postId) {
     //특정 게시글 조회
     @GetMapping("/{postId}")
     @Operation(summary = "특정 게시글 조회 API", description = "특정 게시글을 조회합니다.")
-    public ApiResponse<PostResponseDTO.PostPreviewDTO> findPost(@PathVariable Long postId){
-        Object request;
-        Post findPost = postQueryService.findById(postId);
+    public ApiResponse<PostResponseDTO.PostPreviewDTO> findPost(
+            @PathVariable Long postId,
+            @AuthenticationPrincipal CustomMemberDetails memberDetails
+    ) {
+        Long memberId = (memberDetails != null) ? memberDetails.getId() : 0;
+        Post findPost = postQueryService.findById(postId, memberId);
         return ApiResponse.onSuccess(SuccessStatus.POST_OK, PostConverter.toPostPreviewDTO(findPost));
     }
 
@@ -186,7 +187,7 @@ public ApiResponse<PostResponseDTO.PostAdjacentDTO> findAdjacentPosts(@PathVaria
     // 전체 인기글 or 최신글 조회
     @Operation(summary = "공개글 리스트 조회", description = "popular/latest 입력 시 인기글/최신글 조회")
     @GetMapping("/list")
-    public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> getPostList(
+    public ApiResponse<Page<PostResponseDTO.PostPreviewDTO>> getPostList(
             @PageableDefault(size = 9) Pageable pageable
     ) {
         Page<Post> postPage = postService.getPostList(pageable);
@@ -196,12 +197,12 @@ public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> getPostList(
     // 카테고리 인기글 조회
     @Operation(summary = "카테고리 인기글/최신글 조회 (popular/latest 입력 (기본 popular)")
     @GetMapping("/category/{category_id}")
-    public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> getCategoryPopularPosts(
+    public ApiResponse<Page<PostResponseDTO.PostPreviewDTO>> getCategoryPopularPosts(
             @AuthenticationPrincipal CustomMemberDetails memberDetails,
             @PathVariable("category_id") Long categoryId,
             @PageableDefault(size = 9, sort = "popular") Pageable pageable
     ) {
-        Long memberId = memberDetails.getId();
+        Long memberId = (memberDetails != null) ? memberDetails.getId() : 0;
         Page<Post> postPage = postService.getCategoryPosts(memberId, categoryId, pageable);
         return ApiResponse.onSuccess(SuccessStatus.POST_OK, PostConverter.toPostListResponseDto(postPage));
     }
@@ -221,7 +222,7 @@ public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> getCategoryPopul
     // 게시글 검색 결과 페이지네이션
     @Operation(summary = "게시글 검색 결과 페이지네이션", description = "게시글(제목/내용) 키워드 검색 결과를 페이지네이션하여 반환합니다.")
     @GetMapping("/search")
-    public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> searchPost(
+    public ApiResponse<Page<PostResponseDTO.PostPreviewDTO>> searchPost(
             @RequestParam(value = "keyword", defaultValue = "", required = false) String keyword,
             @AuthenticationPrincipal CustomMemberDetails memberDetails,
             @PageableDefault(size = 9) Pageable pageable
@@ -249,7 +250,7 @@ public ApiResponse<PostResponseDTO.UpdatePostResultDTO> setPostCategory(
     // 게시글 검색 (저자 이름, 팀 이름, 프로젝트 이름으로 검색)
     @GetMapping("/search_by_name")
     @Operation(summary = "게시글 검색 (저자 이름, 팀 이름, 프로젝트 이름으로 검색)")
-    public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> searchByName(
+    public ApiResponse<Page<PostResponseDTO.PostPreviewDTO>> searchByName(
             @RequestParam(value = "author", defaultValue = "", required = false) String authorName,
             @RequestParam(value = "team", defaultValue = "", required = false) String teamName,
             @RequestParam(value = "project", defaultValue = "", required = false) String projectName,
@@ -292,16 +293,20 @@ public ApiResponse<String> cancelBookmark(
 
     @GetMapping("/following/paging")
     @Operation(summary = "팔로잉한 멤버/팀의 게시글 리스트 페이징 조회 API", description = "팔로잉한 멤버/팀의 게시글 리스트를 페이징으로 조회합니다. **첫 페이지는 0부터 입니다.**")
-    public ApiResponse<PostResponseDTO.PostPreviewListDTO> findPostByFollowing(@AuthenticationPrincipal CustomMemberDetails memberDetails,
-                                                                               @PageableDefault(size = 9) Pageable pageable) {
+    public ApiResponse<PostResponseDTO.PostPreviewListDTO> findPostByFollowing(
+            @AuthenticationPrincipal CustomMemberDetails memberDetails,
+            @PageableDefault(size = 9) Pageable pageable
+    ) {
         Page<Post> posts = postQueryService.getPostsByFollowing(memberDetails.getId(), pageable);
         return ApiResponse.onSuccess(SuccessStatus.POST_OK, PostConverter.toPostPreviewListDTO(posts));
     }
 
     @GetMapping("/bookmark/paging")
     @Operation(summary = "북마크한 게시글 조회")
-    public ApiResponse<Page<PostResponseDTO.SimplePostResponseDTO>> getBookmarkPost(@AuthenticationPrincipal CustomMemberDetails memberDetails,
-                                                                                    @PageableDefault(size = 9) Pageable pageable) {
+    public ApiResponse<Page<PostResponseDTO.PostPreviewDTO>> getBookmarkPost(
+            @AuthenticationPrincipal CustomMemberDetails memberDetails,
+            @PageableDefault(size = 9) Pageable pageable
+    ) {
         return ApiResponse.onSuccess(SuccessStatus.POST_OK,
                 PostConverter.toPostListResponseDto(postQueryService.getBookmarkPost(memberDetails.getId(), pageable)));
     }
diff --git a/src/main/java/com/codiary/backend/domain/post/converter/PostConverter.java b/src/main/java/com/codiary/backend/domain/post/converter/PostConverter.java
index 778aeae..ab1480d 100644
--- a/src/main/java/com/codiary/backend/domain/post/converter/PostConverter.java
+++ b/src/main/java/com/codiary/backend/domain/post/converter/PostConverter.java
@@ -15,28 +15,31 @@
 
 public class PostConverter {
 
-    public static Page<PostResponseDTO.SimplePostResponseDTO> toPostListResponseDto(Page<Post> postList) {
-        return postList.map(PostConverter::toSimplePostResponseDto);
+    public static Page<PostResponseDTO.PostPreviewDTO> toPostListResponseDto(Page<Post> postList) {
+        return postList.map(PostConverter::toPostPreviewDTO);
     }
 
-    public static PostResponseDTO.SimplePostResponseDTO toSimplePostResponseDto(Post post) {
-        return PostResponseDTO.SimplePostResponseDTO.builder()
+    public static PostResponseDTO.PostPreviewDTO toPostPreviewDTO(Post post) {
+        return PostResponseDTO.PostPreviewDTO.builder()
                 .id(post.getPostId())
                 .title(post.getPostTitle())
                 .body(post.getPostBody())
-                .author(post.getMember() != null ? post.getMember().getNickname() : null)
-                .authorImageUrl((post.getMember() != null && post.getMember().getImage() != null)
-                        ? post.getMember().getImage().getImageUrl()
-                        : "")
-                .thumbnailImageUrl(post.getThumbnailImage() != null ? post.getThumbnailImage().getFileUrl() : "")
-                .teamProfileImageUrl((post.getTeam() != null && post.getTeam().getProfileImage() != null)
-                        ? post.getTeam().getProfileImage().getImageUrl()
-                        : "")
-                .teamBannerImageUrl((post.getTeam() != null && post.getTeam().getBannerImage() != null)
-                        ? post.getTeam().getBannerImage().getImageUrl()
-                        : "")
+                .thumbnailImageUrl((post.getThumbnailImage() != null) ? post.getThumbnailImage().getFileUrl() : "")
                 .createdAt(post.getCreatedAt())
                 .updatedAt(post.getUpdatedAt())
+
+                .authorId(post.getMember().getMemberId())
+                .authorName(post.getMember().getNickname())
+                .authorImageUrl((post.getMember().getImage() != null) ? post.getMember().getImage().getImageUrl() : "")
+
+                .numberOfCoauthor(post.getAuthorList().size())
+
+                .teamExist((post.getTeam() != null) ? true : false)
+                .teamId((post.getTeam() != null) ? post.getTeam().getTeamId() : null)
+                .teamName((post.getTeam() != null) ? post.getTeam().getName() : null)
+                .teamProfileImageUrl((post.getTeam() != null && post.getTeam().getProfileImage() != null)
+                        ? post.getTeam().getProfileImage().getImageUrl()
+                        : null)
                 .build();
     }
 
@@ -118,45 +121,6 @@ public static PostResponseDTO.UpdatePostResultDTO toUpdatePostResultDTO(Post pos
                 .build();
     }
 
-    // Post 조회
-    public static PostResponseDTO.PostPreviewDTO toPostPreviewDTO(Post post) {
-        List<String> postCategories = post.getCategoriesList().stream()
-                .map(Category::getName)
-                .collect(Collectors.toList());
-
-        return PostResponseDTO.PostPreviewDTO.builder()
-                .postId(post.getPostId())
-                .memberId(post.getMember().getMemberId())
-                .authorNickname(post.getMember().getNickname())
-                .teamId(post.getTeam() != null ? post.getTeam().getTeamId() : null)
-                .projectId(post.getProject() != null ? post.getProject().getProjectId() : null)
-                .postTitle(post.getPostTitle())
-                .postBody(post.getPostBody())
-                .postStatus(post.getPostStatus())
-                .postCategory(String.join(", ", postCategories))
-                .coauthorIds(post.getAuthorList().stream()
-                        .map(author -> author.getMember().getMemberId())
-                        .collect(Collectors.toSet()))
-                .postAccess(post.getPostAccess())
-                .authorProfileImageUrl((post.getMember().getImage() != null)
-                        ? post.getMember().getImage().getImageUrl()
-                        : "")
-                .thumbnailImageUrl((post.getThumbnailImage() != null)
-                        ? post.getThumbnailImage().getFileUrl()
-                        : "")
-                .teamProfileImageUrl((post.getTeam() != null && post.getTeam().getProfileImage() != null)
-                        ? post.getTeam().getProfileImage().getImageUrl()
-                        : "")
-                .teamBannerImageUrl((post.getTeam() != null && post.getTeam().getBannerImage() != null)
-                        ? post.getTeam().getBannerImage().getImageUrl()
-                        : "")
-                .postFileList(PostFileConverter.toPostFileListDTO(post.getPostFileList()))
-                .createdAt(post.getCreatedAt())
-                .updatedAt(post.getUpdatedAt())
-                .authorNickname(post.getMember().getNickname())
-                .build();
-    }
-
     // Post 전체 리스트 조회
     public static PostResponseDTO.PostPreviewListDTO toPostPreviewListDTO(Page<Post> posts) {
         List<PostResponseDTO.PostPreviewDTO> postPreviewDTOList = posts.getContent().stream()
@@ -173,8 +137,6 @@ public static PostResponseDTO.PostPreviewListDTO toPostPreviewListDTO(Page<Post>
                 .build();
     }
 
-
-
     // 저자별 Post 조회
     public static PostResponseDTO.MemberPostPreviewDTO toMemberPostPreviewDTO(Post post) {
         List<String> postCategories = post.getCategoriesList().stream()
@@ -445,52 +407,13 @@ public static PostResponseDTO.MemberPostInTeamPreviewListDTO toMemberPostInTeamP
                 .build();
     }
 
-    // 특정 Post의 인접한 Post 조회 (이전, 다음 Post 조회)
-    public static PostResponseDTO.PostAdjacentDTO.PostAdjacentPreviewDTO toPostAdjacentPreviewDTO(Post post) {
-        if (post == null) return null;
-
-        List<String> postCategories = post.getCategoriesList().stream()
-                .map(Category::getName)
-                .collect(Collectors.toList());
-
-        return PostResponseDTO.PostAdjacentDTO.PostAdjacentPreviewDTO.builder()
-                .postId(post.getPostId())
-                .memberId(post.getMember().getMemberId())
-                .authorNickname(post.getMember().getNickname())
-                .teamId(post.getTeam() != null ? post.getTeam().getTeamId() : null)
-                .projectId(post.getProject() != null ? post.getProject().getProjectId() : null)
-                .postTitle(post.getPostTitle())
-                .postBody(post.getPostBody())
-                .postStatus(post.getPostStatus())
-                .postCategory(String.join(", ", postCategories))
-                .coauthorIds(post.getAuthorList().stream()
-                        .map(author -> author.getMember().getMemberId())
-                        .collect(Collectors.toSet()))
-                .postAccess(post.getPostAccess())
-                .authorProfileImageUrl((post.getMember().getImage() != null)
-                        ? post.getMember().getImage().getImageUrl()
-                        : "")
-                .thumbnailImageUrl((post.getThumbnailImage() != null)
-                        ? post.getThumbnailImage().getFileUrl()
-                        : "")
-                .teamProfileImageUrl((post.getTeam() != null && post.getTeam().getProfileImage() != null)
-                        ? post.getTeam().getProfileImage().getImageUrl()
-                        : "")
-                .teamBannerImageUrl((post.getTeam() != null && post.getTeam().getBannerImage() != null)
-                        ? post.getTeam().getBannerImage().getImageUrl()
-                        : "")
-                .postFileList(PostFileConverter.toPostFileListDTO(post.getPostFileList()))
-                .createdAt(post.getCreatedAt())
-                .updatedAt(post.getUpdatedAt())
-                .build();
-    }
-
+    // 인접 post 조회
     public static PostResponseDTO.PostAdjacentDTO toPostAdjacentDTO(Post.PostAdjacent adjacent) {
         return PostResponseDTO.PostAdjacentDTO.builder()
                 .hadOlder(adjacent.getOlderPost() != null)
                 .hasLater(adjacent.getLaterPost() != null)
-                .olderPost(toPostAdjacentPreviewDTO(adjacent.getOlderPost()))
-                .laterPost(toPostAdjacentPreviewDTO(adjacent.getLaterPost()))
+                .olderPost(toPostPreviewDTO(adjacent.getOlderPost()))
+                .laterPost(toPostPreviewDTO(adjacent.getLaterPost()))
                 .build();
     }
 
diff --git a/src/main/java/com/codiary/backend/domain/post/dto/response/PostResponseDTO.java b/src/main/java/com/codiary/backend/domain/post/dto/response/PostResponseDTO.java
index 6b16a55..10a5582 100644
--- a/src/main/java/com/codiary/backend/domain/post/dto/response/PostResponseDTO.java
+++ b/src/main/java/com/codiary/backend/domain/post/dto/response/PostResponseDTO.java
@@ -16,17 +16,26 @@ public class PostResponseDTO {
     @Builder
     @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
     @JsonInclude(JsonInclude.Include.NON_NULL)
-    public record SimplePostResponseDTO(
+    public record PostPreviewDTO(
+            // post 자체 정보
             Long id,
             String title,
             String body,
-            String author,
-            String authorImageUrl,
             String thumbnailImageUrl,
-            String teamProfileImageUrl,
-            String teamBannerImageUrl,
             LocalDateTime createdAt,
-            LocalDateTime updatedAt
+            LocalDateTime updatedAt,
+            Integer numberOfBookmark,
+            // author 정보
+            Long authorId,
+            String authorName,
+            String authorImageUrl,
+            // coauthor 정보
+            Integer numberOfCoauthor,
+            // team 정보
+            Boolean teamExist, // true 인 경우 아래 내용 작성
+            Long teamId,
+            String teamName,
+            String teamProfileImageUrl
     ) {
     }
 
@@ -89,32 +98,6 @@ public static class UpdatePostResultDTO {
         LocalDateTime updatedAt;
     }
 
-
-    @Builder
-    @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
-    @JsonInclude(JsonInclude.Include.NON_NULL)
-    public record PostPreviewDTO ( // Post 조회
-        Long postId,
-        Long memberId,
-        String authorNickname,
-        String authorProfileImageUrl,
-        Long teamId,
-        String teamProfileImageUrl,
-        String teamBannerImageUrl,
-        Long projectId,
-        String postTitle,
-        String postBody,
-        String thumbnailImageUrl,
-        Boolean postStatus,
-        String postCategory,
-        Set<Long> coauthorIds,
-        PostAccess postAccess,
-        PostFileResponseDTO.PostFileListDTO postFileList,
-        LocalDateTime createdAt,
-        LocalDateTime updatedAt
-    ){
-    }
-
     @Builder
     @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
     @JsonInclude(JsonInclude.Include.NON_NULL)
@@ -327,8 +310,8 @@ public record MemberPostInTeamPreviewListDTO(
     public record PostAdjacentDTO(
             Boolean hasLater,
             Boolean hadOlder,
-            PostAdjacentPreviewDTO laterPost,
-            PostAdjacentPreviewDTO olderPost
+            PostPreviewDTO laterPost,
+            PostPreviewDTO olderPost
     ) {
         @Builder
         @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
diff --git a/src/main/java/com/codiary/backend/domain/post/repository/PostRepository.java b/src/main/java/com/codiary/backend/domain/post/repository/PostRepository.java
index 7676e62..c807dae 100644
--- a/src/main/java/com/codiary/backend/domain/post/repository/PostRepository.java
+++ b/src/main/java/com/codiary/backend/domain/post/repository/PostRepository.java
@@ -14,8 +14,6 @@
 
 public interface PostRepository extends JpaRepository<Post, Long>, PostRepositoryCustom {
 
-    Page<Post> findAllByPostTitleContainingIgnoreCaseOrderByCreatedAtDesc(String postTitle, Pageable pageable);
-    Page<Post> findAllByOrderByCreatedAtDesc(Pageable pageable);
     Page<Post> findByMemberOrderByCreatedAtDescPostIdDesc(Member member, Pageable pageable);
     Page<Post> findByTeamOrderByCreatedAtDescPostIdDesc(Team team, Pageable pageable);
     Page<Post> findByProjectAndMemberOrderByCreatedAtDescPostIdDesc(Project project, Member member, Pageable pageable);
@@ -25,15 +23,6 @@ public interface PostRepository extends JpaRepository<Post, Long>, PostRepositor
     Page<Post> findByTeamAndMemberOrderByCreatedAtDescPostIdDesc(Team team, Member member, Pageable pageable);
     Page<Post> findByTeamAndAuthorList_MemberOrderByCreatedAtDescPostIdDesc(Team team, Member member, Pageable pageable);
 
-    Optional<Post> findTopByMemberAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Member member, Long postId);
-
-    Optional<Post> findTopByMemberAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Member member, Long postId);
-
-    Optional<Post> findTopByTeamAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Team team, Long postId);
-
-    Optional<Post> findTopByTeamAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Team team, Long postId);
-
-
     boolean existsByTeam(Team team);
     boolean existsByProject(Project project);
     boolean existsByMember(Member member);
diff --git a/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryCustom.java b/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryCustom.java
index ad0eb15..021ca93 100644
--- a/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryCustom.java
+++ b/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryCustom.java
@@ -3,9 +3,11 @@
 import com.codiary.backend.domain.member.entity.Member;
 import com.codiary.backend.domain.post.entity.Post;
 import com.codiary.backend.domain.project.entity.Project;
+import com.codiary.backend.domain.team.entity.Team;
 import java.time.LocalDate;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 
@@ -25,4 +27,18 @@ public interface PostRepositoryCustom {
     Page<Post> findByBookmarkPostList(Member member, Pageable pageable);
     
     Page<Post> getPostsByName(Long memberId, String authorName, String teamName, String projectName, Pageable pageable);
+
+    Optional<Post> findByIdWithTeam(Long postId, Long requesterId);
+
+    Page<Post> findAllByPostTitleContainingIgnoreCaseOrderByCreatedAtDesc(String postTitle, Pageable pageable);
+
+    Page<Post> findAllByOrderByCreatedAtDesc(Pageable pageable);
+
+    Optional<Post> findTopByTeamAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Team team, Long postId);
+
+    Optional<Post> findTopByTeamAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Team team, Long postId);
+
+    Optional<Post> findTopByMemberAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Member member, Long postId);
+
+    Optional<Post> findTopByMemberAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Member member, Long postId);
 }
diff --git a/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryImpl.java b/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryImpl.java
index c88f63c..f9e47d2 100644
--- a/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryImpl.java
+++ b/src/main/java/com/codiary/backend/domain/post/repository/PostRepositoryImpl.java
@@ -14,6 +14,7 @@
 import com.codiary.backend.domain.post.entity.Post;
 import com.codiary.backend.domain.post.enumerate.PostAccess;
 import com.codiary.backend.domain.project.entity.Project;
+import com.codiary.backend.domain.team.entity.Team;
 import com.querydsl.core.BooleanBuilder;
 import com.querydsl.core.types.Order;
 import com.querydsl.core.types.OrderSpecifier;
@@ -25,6 +26,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
@@ -171,6 +173,7 @@ public Page<Post> getPostsByCategoryId(Long memberId, Long categoryId, Pageable
         List<Post> posts = queryFactory
                 .selectDistinct(post)
                 .from(post)
+                .leftJoin(post.team, team).fetchJoin()
                 .where(post.categoriesList.any().categoryId.eq(categoryId).and(canAccess(memberId)))
                 .orderBy(getOrderBy(pageable.getSort()))
                 .offset(pageable.getOffset())
@@ -244,6 +247,7 @@ public Page<Post> findByBookmarkPostList(Member member, Pageable pageable) {
                 .distinct()
                 .from(post)
                 .leftJoin(post.bookmarkList, bookmark).fetchJoin()
+                .leftJoin(post.team, team).fetchJoin()
                 .where(bookmark.member.memberId.eq(member.getMemberId())
                         .and(post.deletedAt.isNull()))
                 .offset(pageable.getOffset())
@@ -291,18 +295,10 @@ public Page<Post> getPostsByName(
         Long total = queryFactory
                 .select(post.countDistinct())
                 .from(post)
-                // member join
-                .leftJoin(post.member, member)
-                // team join
-                .leftJoin(post.team, team)
-                // project join
-                .leftJoin(post.project, project)
                 // 조건 탐색
                 .where(
                         canAccess(memberId).and(booleanBuilder)
                 )
-                .offset(pageable.getOffset())
-                .limit(pageable.getPageSize())
                 .fetchOne();
 
         return new PageImpl<>(posts, pageable, total);
@@ -318,4 +314,115 @@ private BooleanBuilder searchBy(String authorName, String teamName, String proje
         }
         return new BooleanBuilder();
     }
+
+    @Override
+    public Optional<Post> findByIdWithTeam(Long postId, Long requesterId) {
+        Optional<Post> fetchedPost = Optional.ofNullable(queryFactory
+                .select(post)
+                .from(post)
+                .leftJoin(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.postId.eq(postId).and(canAccess(requesterId)))
+                .fetchFirst()
+        );
+        return fetchedPost;
+    }
+
+    @Override
+    public Page<Post> findAllByPostTitleContainingIgnoreCaseOrderByCreatedAtDesc(String postTitle, Pageable pageable) {
+        List<Post> posts = queryFactory
+                .select(post)
+                .from(post)
+                .leftJoin(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.postTitle.containsIgnoreCase(postTitle))
+                .orderBy(post.createdAt.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        Long total = queryFactory
+                .select(post.countDistinct())
+                .from(post)
+                .where(post.postTitle.containsIgnoreCase(postTitle))
+                .fetchOne();
+
+        return new PageImpl<>(posts, pageable, total);
+    }
+
+    @Override
+    public Page<Post> findAllByOrderByCreatedAtDesc(Pageable pageable) {
+        List<Post> posts = queryFactory
+                .select(post)
+                .from(post)
+                .leftJoin(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .orderBy(post.createdAt.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        Long total = queryFactory
+                .select(post.countDistinct())
+                .from(post)
+                .fetchOne();
+
+        return new PageImpl<>(posts, pageable, total);
+    }
+
+    @Override
+    public Optional<Post> findTopByTeamAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Team findTeam, Long postId) {
+        Optional<Post> fetchedPost = Optional.ofNullable(queryFactory
+                .select(post)
+                .from(post)
+                .join(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.team.eq(findTeam).and(post.postId.lt(postId)))
+                .orderBy(post.createdAt.desc(), post.postId.desc())
+                .fetchFirst());
+
+        return fetchedPost;
+    }
+
+    @Override
+    public Optional<Post> findTopByTeamAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Team findTeam, Long postId) {
+        Optional<Post> fetchedPost = Optional.ofNullable(queryFactory
+                .select(post)
+                .from(post)
+                .join(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.team.eq(findTeam).and(post.postId.gt(postId)))
+                .orderBy(post.createdAt.desc(), post.postId.desc())
+                .fetchFirst());
+
+        return fetchedPost;
+    }
+
+    @Override
+    public Optional<Post> findTopByMemberAndPostIdLessThanOrderByCreatedAtDescPostIdDesc(Member member, Long postId) {
+        Optional<Post> fetchedPost = Optional.ofNullable(queryFactory
+                .select(post)
+                .from(post)
+                .leftJoin(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.member.eq(member).and(post.postId.lt(postId)))
+                .orderBy(post.createdAt.desc(), post.postId.desc())
+                .fetchFirst());
+
+        return fetchedPost;
+    }
+
+    @Override
+    public Optional<Post> findTopByMemberAndPostIdGreaterThanOrderByCreatedAtAscPostIdAsc(Member member, Long postId) {
+        Optional<Post> fetchedPost = Optional.ofNullable(queryFactory
+                .select(post)
+                .from(post)
+                .leftJoin(post.team, team).fetchJoin()
+                .leftJoin(team.profileImage, teamProfileImage).fetchJoin()
+                .where(post.member.eq(member).and(post.postId.gt(postId)))
+                .orderBy(post.createdAt.desc(), post.postId.desc())
+                .fetchFirst());
+
+        return fetchedPost;
+    }
 }
diff --git a/src/main/java/com/codiary/backend/domain/post/service/PostQueryService.java b/src/main/java/com/codiary/backend/domain/post/service/PostQueryService.java
index 0e17f24..e7e442f 100644
--- a/src/main/java/com/codiary/backend/domain/post/service/PostQueryService.java
+++ b/src/main/java/com/codiary/backend/domain/post/service/PostQueryService.java
@@ -12,9 +12,11 @@
 import com.codiary.backend.global.apiPayload.code.status.ErrorStatus;
 import com.codiary.backend.global.apiPayload.exception.GeneralException;
 import com.codiary.backend.global.apiPayload.exception.handler.PostHandler;
-
-import java.util.*;
-
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.domain.Page;
@@ -59,11 +61,9 @@ private Member getAuthenticatedMember() {
     }
 
 
-    public Post findById(Long postId) {
-        Post post = postRepository.findById(postId)
+    public Post findById(Long postId, Long requesterId) {
+        Post post = postRepository.findByIdWithTeam(postId, requesterId)
                 .orElseThrow(() -> new GeneralException(ErrorStatus.POST_NOT_FOUND));
-        Member member = getAuthenticatedMember();
-        validatePostAccess(post, member);
         return post;
     }