diff --git a/src/main/java/page/clab/api/external/community/board/application/port/ExternalRegisterBoardHashtagUseCase.java b/src/main/java/page/clab/api/domain/community/board/application/port/in/RegisterBoardHashtagUseCase.java
similarity index 57%
rename from src/main/java/page/clab/api/external/community/board/application/port/ExternalRegisterBoardHashtagUseCase.java
rename to src/main/java/page/clab/api/domain/community/board/application/port/in/RegisterBoardHashtagUseCase.java
index fb9cd2c4a..91b847645 100644
--- a/src/main/java/page/clab/api/external/community/board/application/port/ExternalRegisterBoardHashtagUseCase.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/port/in/RegisterBoardHashtagUseCase.java
@@ -1,7 +1,7 @@
-package page.clab.api.external.community.board.application.port;
+package page.clab.api.domain.community.board.application.port.in;
 
 import page.clab.api.domain.community.board.application.dto.request.BoardHashtagRequestDto;
 
-public interface ExternalRegisterBoardHashtagUseCase {
+public interface RegisterBoardHashtagUseCase {
     Long registerBoardHashtag(BoardHashtagRequestDto requestDto);
 }
diff --git a/src/main/java/page/clab/api/external/community/board/application/port/ExternalRetrieveBoardHashtagUseCase.java b/src/main/java/page/clab/api/domain/community/board/application/port/in/RetrieveBoardHashtagUseCase.java
similarity index 71%
rename from src/main/java/page/clab/api/external/community/board/application/port/ExternalRetrieveBoardHashtagUseCase.java
rename to src/main/java/page/clab/api/domain/community/board/application/port/in/RetrieveBoardHashtagUseCase.java
index 1764ada44..1433b9188 100644
--- a/src/main/java/page/clab/api/external/community/board/application/port/ExternalRetrieveBoardHashtagUseCase.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/port/in/RetrieveBoardHashtagUseCase.java
@@ -1,12 +1,10 @@
-package page.clab.api.external.community.board.application.port;
+package page.clab.api.domain.community.board.application.port.in;
 
 import java.util.List;
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.Pageable;
 import page.clab.api.domain.community.board.application.dto.response.BoardHashtagResponseDto;
 import page.clab.api.domain.community.board.domain.BoardHashtag;
 
-public interface ExternalRetrieveBoardHashtagUseCase {
+public interface RetrieveBoardHashtagUseCase {
     List<BoardHashtagResponseDto> getBoardHashtagInfoByBoardId(Long boardId);
 
     List<BoardHashtag> getAllByBoardId(Long boardId);
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardDetailsRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardDetailsRetrievalService.java
index 4221b9e36..45fe333d1 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardDetailsRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardDetailsRetrievalService.java
@@ -4,9 +4,7 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
-import page.clab.api.domain.community.board.adapter.out.persistence.BoardHashtagJpaEntity;
 import page.clab.api.domain.community.board.application.dto.mapper.BoardDtoMapper;
-import page.clab.api.domain.community.board.application.dto.mapper.BoardHashtagDtoMapper;
 import page.clab.api.domain.community.board.application.dto.response.BoardDetailsResponseDto;
 import page.clab.api.domain.community.board.application.dto.response.BoardEmojiCountResponseDto;
 import page.clab.api.domain.community.board.application.dto.response.BoardHashtagResponseDto;
@@ -14,10 +12,7 @@
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardEmojiPort;
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardPort;
 import page.clab.api.domain.community.board.domain.Board;
-import page.clab.api.domain.community.board.domain.BoardHashtag;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.service.ExternalBoardHashtagRetrieveService;
-import page.clab.api.external.hashtag.application.port.ExternalRetrieveHashtagUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 
 import java.util.List;
@@ -30,7 +25,7 @@ public class BoardDetailsRetrievalService implements RetrieveBoardDetailsUseCase
     private final RetrieveBoardPort retrieveBoardPort;
     private final RetrieveBoardEmojiPort retrieveBoardEmojiPort;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalBoardHashtagRetrieveService externalBoardHashtagRetrieveService;
+    private final BoardHashtagRetrieveService boardHashtagRetrieveService;
     private final BoardDtoMapper boardDtoMapper;
 
     @Transactional
@@ -41,7 +36,7 @@ public BoardDetailsResponseDto retrieveBoardDetails(Long boardId) {
         MemberDetailedInfoDto memberInfo = externalRetrieveMemberUseCase.getMemberDetailedInfoById(board.getMemberId());
         boolean isOwner = board.isOwner(currentMemberInfo.getMemberId());
         List<BoardEmojiCountResponseDto> emojiInfos = getBoardEmojiCountResponseDtoList(boardId, currentMemberInfo.getMemberId());
-        List<BoardHashtagResponseDto> boardHashtagInfos = externalBoardHashtagRetrieveService.getBoardHashtagInfoByBoardId(boardId);
+        List<BoardHashtagResponseDto> boardHashtagInfos = boardHashtagRetrieveService.getBoardHashtagInfoByBoardId(boardId);
         return boardDtoMapper.toDto(board, memberInfo, isOwner, emojiInfos, boardHashtagInfos);
     }
 
diff --git a/src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRegisterService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRegisterService.java
similarity index 84%
rename from src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRegisterService.java
rename to src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRegisterService.java
index 354c1eacc..5ea65ef97 100644
--- a/src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRegisterService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRegisterService.java
@@ -1,11 +1,11 @@
-package page.clab.api.external.community.board.application.service;
+package page.clab.api.domain.community.board.application.service;
 
 import jakarta.transaction.Transactional;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import page.clab.api.domain.community.board.application.dto.mapper.BoardHashtagDtoMapper;
 import page.clab.api.domain.community.board.application.dto.request.BoardHashtagRequestDto;
-import page.clab.api.external.community.board.application.port.ExternalRegisterBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RegisterBoardHashtagUseCase;
 import page.clab.api.domain.community.board.application.port.out.RegisterBoardHashtagPort;
 import page.clab.api.domain.community.board.domain.BoardHashtag;
 import page.clab.api.external.hashtag.application.port.ExternalRetrieveHashtagUseCase;
@@ -13,7 +13,7 @@
 
 @Service
 @RequiredArgsConstructor
-public class ExternalBoardHashtagRegisterService implements ExternalRegisterBoardHashtagUseCase {
+public class BoardHashtagRegisterService implements RegisterBoardHashtagUseCase {
 
     private final RegisterBoardHashtagPort registerBoardHashtagPort;
     private final ExternalRetrieveHashtagUseCase externalRetrieveHashtagUseCase;
diff --git a/src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRetrieveService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRetrieveService.java
similarity index 86%
rename from src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRetrieveService.java
rename to src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRetrieveService.java
index 805c53580..df506f41f 100644
--- a/src/main/java/page/clab/api/external/community/board/application/service/ExternalBoardHashtagRetrieveService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardHashtagRetrieveService.java
@@ -1,20 +1,19 @@
-package page.clab.api.external.community.board.application.service;
+package page.clab.api.domain.community.board.application.service;
 
 import java.util.List;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
-import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import page.clab.api.domain.community.board.application.dto.mapper.BoardHashtagDtoMapper;
 import page.clab.api.domain.community.board.application.dto.response.BoardHashtagResponseDto;
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardHashtagPort;
 import page.clab.api.domain.community.board.domain.BoardHashtag;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.hashtag.application.port.ExternalRetrieveHashtagUseCase;
 
 @Service
 @RequiredArgsConstructor
-public class ExternalBoardHashtagRetrieveService implements ExternalRetrieveBoardHashtagUseCase {
+public class BoardHashtagRetrieveService implements RetrieveBoardHashtagUseCase {
 
     private final RetrieveBoardHashtagPort retrieveBoardHashtagPort;
     private final ExternalRetrieveHashtagUseCase externalRetrieveHashtagUseCase;
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardRegisterService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardRegisterService.java
index 896a1d115..1719fdfa8 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardRegisterService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardRegisterService.java
@@ -2,7 +2,6 @@
 
 import java.util.List;
 import lombok.RequiredArgsConstructor;
-import org.apache.coyote.BadRequestException;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -14,7 +13,7 @@
 import page.clab.api.domain.community.board.application.port.out.RegisterBoardPort;
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRegisterBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RegisterBoardHashtagUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.external.memberManagement.notification.application.port.ExternalSendNotificationUseCase;
 import page.clab.api.global.common.file.application.UploadedFileService;
@@ -31,7 +30,7 @@ public class BoardRegisterService implements RegisterBoardUseCase {
     private final RegisterBoardPort registerBoardPort;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
     private final ExternalSendNotificationUseCase externalSendNotificationUseCase;
-    private final ExternalRegisterBoardHashtagUseCase externalRegisterBoardHashtagUseCase;
+    private final RegisterBoardHashtagUseCase registerBoardHashtagUseCase;
     private final UploadedFileService uploadedFileService;
     private final ApplicationEventPublisher eventPublisher;
     private final BoardDtoMapper boardDtoMapper;
@@ -71,7 +70,7 @@ public String registerBoard(BoardRequestDto requestDto) throws PermissionDeniedE
             throw new InvalidBoardCategoryHashtagException("개발질문 게시판에만 해시태그를 등록할 수 있습니다.");
         }
         if (savedBoard.isDevelopmentQna() && requestDto.getHashtagIdList() != null) {
-            externalRegisterBoardHashtagUseCase.registerBoardHashtag(boardHashtagDtoMapper.toDto(savedBoard.getId(), requestDto.getHashtagIdList()));
+            registerBoardHashtagUseCase.registerBoardHashtag(boardHashtagDtoMapper.toDto(savedBoard.getId(), requestDto.getHashtagIdList()));
         }
         return savedBoard.getCategory().getKey();
     }
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardRetrievalService.java
index a373e73b6..15a198eb2 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardRetrievalService.java
@@ -14,7 +14,7 @@
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardPort;
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.community.comment.application.port.ExternalRetrieveCommentUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.global.common.dto.PagedResponseDto;
@@ -26,7 +26,7 @@ public class BoardRetrievalService implements RetrieveBoardUseCase {
     private final RetrieveBoardPort retrieveBoardPort;
     private final ExternalRetrieveCommentUseCase externalRetrieveCommentUseCase;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalRetrieveBoardHashtagUseCase externalRetrieveBoardHashtagUseCase;
+    private final RetrieveBoardHashtagUseCase retrieveBoardHashtagUseCase;
     private final BoardDtoMapper mapper;
 
     @Transactional
@@ -49,7 +49,7 @@ private MemberDetailedInfoDto getMemberDetailedInfoByBoard(Board board) {
     @NotNull
     private BoardListResponseDto mapToBoardListResponseDto(Board board, MemberDetailedInfoDto memberInfo) {
         Long commentCount = externalRetrieveCommentUseCase.countByBoardId(board.getId());
-        List<BoardHashtagResponseDto> boardHashtagInfos = externalRetrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
+        List<BoardHashtagResponseDto> boardHashtagInfos = retrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
         return mapper.toListDto(board, memberInfo, commentCount, boardHashtagInfos);
     }
 }
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardUpdateService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardUpdateService.java
index 2255fcbb1..15c01e3b5 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardUpdateService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardUpdateService.java
@@ -4,7 +4,6 @@
 import java.util.Arrays;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -19,8 +18,8 @@
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.community.board.domain.BoardHashtag;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRegisterBoardHashtagUseCase;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RegisterBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.global.exception.PermissionDeniedException;
 
@@ -32,8 +31,8 @@ public class BoardUpdateService implements UpdateBoardUseCase {
     private final RegisterBoardPort registerBoardPort;
     private final RegisterBoardHashtagPort registerBoardHashtagPort;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalRetrieveBoardHashtagUseCase externalRetrieveBoardHashtagUseCase;
-    private final ExternalRegisterBoardHashtagUseCase externalRegisterBoardHashtagUseCase;
+    private final RetrieveBoardHashtagUseCase retrieveBoardHashtagUseCase;
+    private final RegisterBoardHashtagUseCase registerBoardHashtagUseCase;
     private final ApplicationEventPublisher eventPublisher;
     private final BoardHashtagDtoMapper boardHashtagDtoMapper;
 
@@ -44,7 +43,7 @@ public String updateBoard(Long boardId, BoardUpdateRequestDto requestDto) throws
         Board board = retrieveBoardPort.getById(boardId);
         board.validateAccessPermission(currentMemberInfo);
         board.update(requestDto);
-        updateBoardHashtag(board, requestDto.getHashtagIdList(), externalRetrieveBoardHashtagUseCase.getAllIncludingDeletedByBoardId(boardId));
+        updateBoardHashtag(board, requestDto.getHashtagIdList(), retrieveBoardHashtagUseCase.getAllIncludingDeletedByBoardId(boardId));
         eventPublisher.publishEvent(new BoardUpdatedEvent(this, board.getId()));
         registerBoardPort.save(board);
         return board.getCategory().getKey();
@@ -56,7 +55,7 @@ public void updateBoardHashtag(Board board, List<Long> newHashtagIds, List<Board
             throw new InvalidBoardCategoryHashtagException("개발질문 게시판에만 해시태그를 적용할 수 있습니다.");
         }
 
-        List<Long> currentHashtagIds = externalRetrieveBoardHashtagUseCase.extractAllHashtagId(currentBoardHashtags);
+        List<Long> currentHashtagIds = retrieveBoardHashtagUseCase.extractAllHashtagId(currentBoardHashtags);
         List<Long> hashtagsToRemove = currentHashtagIds.stream()
                 .filter(id -> !newHashtagIds.contains(id))
                 .toList();
@@ -97,7 +96,7 @@ private void addHashtag(Long boardId, Long hashtagId, List<BoardHashtag> current
                         registerBoardHashtagPort.save(boardHashtag);
                     },
                     () -> {
-                        externalRegisterBoardHashtagUseCase.registerBoardHashtag(
+                        registerBoardHashtagUseCase.registerBoardHashtag(
                                 boardHashtagDtoMapper.toDto(boardId, new ArrayList<>(Arrays.asList(hashtagId)))
                         );
                     }
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByCategoryRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByCategoryRetrievalService.java
index 2a79e8821..ce066bd0a 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByCategoryRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByCategoryRetrievalService.java
@@ -14,7 +14,7 @@
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.community.board.domain.BoardCategory;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.community.comment.application.port.ExternalRetrieveCommentUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.global.common.dto.PagedResponseDto;
@@ -26,7 +26,7 @@ public class BoardsByCategoryRetrievalService implements RetrieveBoardsByCategor
     private final RetrieveBoardPort retrieveBoardPort;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
     private final ExternalRetrieveCommentUseCase externalRetrieveCommentUseCase;
-    private final ExternalRetrieveBoardHashtagUseCase externalRetrieveBoardHashtagUseCase;
+    private final RetrieveBoardHashtagUseCase retrieveBoardHashtagUseCase;
     private final BoardDtoMapper mapper;
 
     @Transactional
@@ -35,7 +35,7 @@ public PagedResponseDto<BoardOverviewResponseDto> retrieveBoardsByCategory(Board
         Page<Board> boards = retrieveBoardPort.findAllByCategory(category, pageable);
         return new PagedResponseDto<>(boards.map(board -> {
             long commentCount = externalRetrieveCommentUseCase.countByBoardId(board.getId());
-            List<BoardHashtagResponseDto> boardHashtagInfos = externalRetrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
+            List<BoardHashtagResponseDto> boardHashtagInfos = retrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
             return mapper.toCategoryDto(board, getMemberDetailedInfoByBoard(board), commentCount, boardHashtagInfos);
         }));
     }
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByHashtagRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByHashtagRetrievalService.java
index 052e0b793..80b933567 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByHashtagRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/BoardsByHashtagRetrievalService.java
@@ -3,8 +3,6 @@
 import java.util.ArrayList;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import page.clab.api.domain.community.board.application.dto.mapper.BoardDtoMapper;
@@ -13,7 +11,7 @@
 import page.clab.api.domain.community.board.application.port.in.RetrieveBoardsByHashtagUseCase;
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardUseCase;
 import page.clab.api.external.community.comment.application.port.ExternalRetrieveCommentUseCase;
 import page.clab.api.external.hashtag.application.port.ExternalRetrieveHashtagUseCase;
@@ -28,7 +26,7 @@ public class BoardsByHashtagRetrievalService implements RetrieveBoardsByHashtagU
     private final ExternalRetrieveHashtagUseCase externalRetrieveHashtagUseCase;
     private final ExternalRetrieveCommentUseCase externalRetrieveCommentUseCase;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalRetrieveBoardHashtagUseCase externalRetrieveBoardHashtagUseCase;
+    private final RetrieveBoardHashtagUseCase retrieveBoardHashtagUseCase;
     private final ExternalRetrieveBoardUseCase externalRetrieveBoardUseCase;
     private final BoardDtoMapper mapper;
 
@@ -39,7 +37,7 @@ public PagedResponseDto<BoardOverviewResponseDto> retrieveBoardsByHashtag(List<S
             hashtagIds.add(externalRetrieveHashtagUseCase.getByName(hashtag).getId());
         }
 
-        List<Long> boardIds = externalRetrieveBoardHashtagUseCase.getBoardIdsByHashTagId(hashtagIds);
+        List<Long> boardIds = retrieveBoardHashtagUseCase.getBoardIdsByHashTagId(hashtagIds);
 
         List<Board> boards = boardIds.stream()
                 .map(externalRetrieveBoardUseCase::getById)
@@ -48,7 +46,7 @@ public PagedResponseDto<BoardOverviewResponseDto> retrieveBoardsByHashtag(List<S
         List<BoardOverviewResponseDto> boardOverviewResponseDtos =
                 boards.stream().map(board -> {
                     long commentCount = externalRetrieveCommentUseCase.countByBoardId(board.getId());
-                    List<BoardHashtagResponseDto> boardHashtagInfos = externalRetrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
+                    List<BoardHashtagResponseDto> boardHashtagInfos = retrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
                     return mapper.toCategoryDto(board, getMemberDetailedInfoByBoard(board), commentCount, boardHashtagInfos);
                 }).toList();
 
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/DeletedBoardsRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/DeletedBoardsRetrievalService.java
index 58d1c556e..eeb960593 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/DeletedBoardsRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/DeletedBoardsRetrievalService.java
@@ -14,7 +14,6 @@
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardPort;
 import page.clab.api.domain.community.board.domain.Board;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberDetailedInfoDto;
-import page.clab.api.external.community.board.application.service.ExternalBoardHashtagRetrieveService;
 import page.clab.api.external.community.comment.application.port.ExternalRetrieveCommentUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.global.common.dto.PagedResponseDto;
@@ -26,7 +25,7 @@ public class DeletedBoardsRetrievalService implements RetrieveDeletedBoardsUseCa
     private final RetrieveBoardPort retrieveBoardPort;
     private final ExternalRetrieveCommentUseCase externalRetrieveCommentUseCase;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalBoardHashtagRetrieveService externalBoardHashtagRetrieveService;
+    private final BoardHashtagRetrieveService boardHashtagRetrieveService;
     private final BoardDtoMapper mapper;
 
     @Transactional(readOnly = true)
@@ -44,7 +43,7 @@ private MemberDetailedInfoDto getMemberDetailedInfoByBoard(Board board) {
     @NotNull
     private BoardListResponseDto mapToBoardListResponseDto(Board board, MemberDetailedInfoDto memberInfo) {
         Long commentCount = externalRetrieveCommentUseCase.countByBoardId(board.getId());
-        List<BoardHashtagResponseDto> boardHashtagInfos = externalBoardHashtagRetrieveService.getBoardHashtagInfoByBoardId(board.getId());
+        List<BoardHashtagResponseDto> boardHashtagInfos = boardHashtagRetrieveService.getBoardHashtagInfoByBoardId(board.getId());
         return mapper.toListDto(board, memberInfo, commentCount, boardHashtagInfos);
     }
 }
diff --git a/src/main/java/page/clab/api/domain/community/board/application/service/MyBoardsRetrievalService.java b/src/main/java/page/clab/api/domain/community/board/application/service/MyBoardsRetrievalService.java
index 61e97a291..1490d99be 100644
--- a/src/main/java/page/clab/api/domain/community/board/application/service/MyBoardsRetrievalService.java
+++ b/src/main/java/page/clab/api/domain/community/board/application/service/MyBoardsRetrievalService.java
@@ -12,9 +12,8 @@
 import page.clab.api.domain.community.board.application.port.in.RetrieveMyBoardsUseCase;
 import page.clab.api.domain.community.board.application.port.out.RetrieveBoardPort;
 import page.clab.api.domain.community.board.domain.Board;
-import page.clab.api.domain.community.board.domain.BoardHashtag;
 import page.clab.api.domain.memberManagement.member.application.dto.shared.MemberBasicInfoDto;
-import page.clab.api.external.community.board.application.port.ExternalRetrieveBoardHashtagUseCase;
+import page.clab.api.domain.community.board.application.port.in.RetrieveBoardHashtagUseCase;
 import page.clab.api.external.memberManagement.member.application.port.ExternalRetrieveMemberUseCase;
 import page.clab.api.global.common.dto.PagedResponseDto;
 
@@ -24,7 +23,7 @@ public class MyBoardsRetrievalService implements RetrieveMyBoardsUseCase {
 
     private final RetrieveBoardPort retrieveBoardPort;
     private final ExternalRetrieveMemberUseCase externalRetrieveMemberUseCase;
-    private final ExternalRetrieveBoardHashtagUseCase externalRetrieveBoardHashtagUseCase;
+    private final RetrieveBoardHashtagUseCase retrieveBoardHashtagUseCase;
     private final BoardDtoMapper mapper;
 
     @Transactional
@@ -33,7 +32,7 @@ public PagedResponseDto<BoardMyResponseDto> retrieveMyBoards(Pageable pageable)
         MemberBasicInfoDto currentMemberInfo = externalRetrieveMemberUseCase.getCurrentMemberBasicInfo();
         Page<Board> boards = retrieveBoardPort.findAllByMemberId(currentMemberInfo.getMemberId(), pageable);
         return new PagedResponseDto<>(boards.map(board -> {
-            List<BoardHashtagResponseDto> boardHashtagInfos = externalRetrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
+            List<BoardHashtagResponseDto> boardHashtagInfos = retrieveBoardHashtagUseCase.getBoardHashtagInfoByBoardId(board.getId());
             return mapper.toDto(board, currentMemberInfo, boardHashtagInfos);
         }));
     }