diff --git a/be/issue-tracker/src/main/java/com/issuetracker/comment/domain/Comment.java b/be/issue-tracker/src/main/java/com/issuetracker/comment/entity/Comment.java
similarity index 85%
rename from be/issue-tracker/src/main/java/com/issuetracker/comment/domain/Comment.java
rename to be/issue-tracker/src/main/java/com/issuetracker/comment/entity/Comment.java
index 8648b058b..44d1b2e43 100644
--- a/be/issue-tracker/src/main/java/com/issuetracker/comment/domain/Comment.java
+++ b/be/issue-tracker/src/main/java/com/issuetracker/comment/entity/Comment.java
@@ -1,16 +1,14 @@
-package com.issuetracker.comment.domain;
+package com.issuetracker.comment.entity;
 
 import java.time.LocalDateTime;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import lombok.Setter;
 import org.springframework.data.annotation.Id;
 
 @RequiredArgsConstructor
 @Getter
 public class Comment {
     @Id
-    @Setter
     private Long id;
     private final String content;
     private final LocalDateTime createDate;
diff --git a/be/issue-tracker/src/main/java/com/issuetracker/comment/repository/CommentRepository.java b/be/issue-tracker/src/main/java/com/issuetracker/comment/repository/CommentRepository.java
index dcb933010..9810e8c15 100644
--- a/be/issue-tracker/src/main/java/com/issuetracker/comment/repository/CommentRepository.java
+++ b/be/issue-tracker/src/main/java/com/issuetracker/comment/repository/CommentRepository.java
@@ -1,6 +1,6 @@
 package com.issuetracker.comment.repository;
 
-import com.issuetracker.comment.domain.Comment;
+import com.issuetracker.comment.entity.Comment;
 import java.util.List;
 import org.springframework.data.repository.CrudRepository;
 
diff --git a/be/issue-tracker/src/main/java/com/issuetracker/comment/service/CommentService.java b/be/issue-tracker/src/main/java/com/issuetracker/comment/service/CommentService.java
index 5f393bc25..d7ea4ab0e 100644
--- a/be/issue-tracker/src/main/java/com/issuetracker/comment/service/CommentService.java
+++ b/be/issue-tracker/src/main/java/com/issuetracker/comment/service/CommentService.java
@@ -1,7 +1,14 @@
 package com.issuetracker.comment.service;
 
-import com.issuetracker.comment.domain.Comment;
+import com.issuetracker.comment.dto.CommentDetailDto;
+import com.issuetracker.comment.entity.Comment;
 import com.issuetracker.comment.repository.CommentRepository;
+import com.issuetracker.comment.util.CommentMapper;
+import com.issuetracker.file.dto.UploadedFileDto;
+import com.issuetracker.file.service.FileService;
+import com.issuetracker.member.dto.SimpleMemberDto;
+import com.issuetracker.member.service.MemberService;
+import java.util.ArrayList;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -11,9 +18,31 @@
 @RequiredArgsConstructor
 @Slf4j
 public class CommentService {
+    private final MemberService memberService;
     private final CommentRepository commentRepository;
+    private final FileService fileService;
 
-    public List<Comment> findCommentsById(Long id) {
-        return commentRepository.findAllByIssueId(id);
+    public List<CommentDetailDto> getCommentDetails(Long id) {
+        List<Comment> comments = commentRepository.findAllByIssueId(id);
+        return toCommentDetails(comments);
+    }
+
+    private List<CommentDetailDto> toCommentDetails(List<Comment> comments) {
+        List<CommentDetailDto> commentDetails = new ArrayList<>();
+        for (Comment comment : comments) {
+            SimpleMemberDto writer = memberService.getSimpleMemberById(comment.getMemberId());
+            UploadedFileDto file = getFileByComment(comment);
+            CommentDetailDto commentDetail = CommentMapper.toCommentDetailDto(comment, writer, file);
+            commentDetails.add(commentDetail);
+        }
+        return commentDetails;
+    }
+
+    private UploadedFileDto getFileByComment(Comment comment) {
+        Long fileId = comment.getFileId();
+        if (fileId == null) {
+            return null;
+        }
+        return fileService.showFile(fileId);
     }
 }
diff --git a/be/issue-tracker/src/main/java/com/issuetracker/comment/util/CommentMapper.java b/be/issue-tracker/src/main/java/com/issuetracker/comment/util/CommentMapper.java
new file mode 100644
index 000000000..0b25f1312
--- /dev/null
+++ b/be/issue-tracker/src/main/java/com/issuetracker/comment/util/CommentMapper.java
@@ -0,0 +1,19 @@
+package com.issuetracker.comment.util;
+
+import com.issuetracker.comment.dto.CommentDetailDto;
+import com.issuetracker.comment.entity.Comment;
+import com.issuetracker.file.dto.UploadedFileDto;
+import com.issuetracker.member.dto.SimpleMemberDto;
+
+public class CommentMapper {
+    public static CommentDetailDto toCommentDetailDto(Comment comment, SimpleMemberDto writer, UploadedFileDto file) {
+        return CommentDetailDto.builder()
+                .id(comment.getId())
+                .content(comment.getContent())
+                .writer(writer)
+                .isWriter(comment.isWriter())
+                .file(file)
+                .createDate(comment.getCreateDate())
+                .build();
+    }
+}
diff --git a/be/issue-tracker/src/main/java/com/issuetracker/issue/service/IssueDetailService.java b/be/issue-tracker/src/main/java/com/issuetracker/issue/service/IssueDetailService.java
index 5f96db306..b148f0bb6 100644
--- a/be/issue-tracker/src/main/java/com/issuetracker/issue/service/IssueDetailService.java
+++ b/be/issue-tracker/src/main/java/com/issuetracker/issue/service/IssueDetailService.java
@@ -1,6 +1,5 @@
 package com.issuetracker.issue.service;
 
-import com.issuetracker.comment.domain.Comment;
 import com.issuetracker.comment.dto.CommentDetailDto;
 import com.issuetracker.comment.service.CommentService;
 import com.issuetracker.file.dto.UploadedFileDto;
@@ -14,7 +13,6 @@
 import com.issuetracker.member.service.MemberService;
 import com.issuetracker.milestone.dto.SimpleMilestoneDto;
 import com.issuetracker.milestone.service.MilestoneService;
-import java.util.ArrayList;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -43,7 +41,7 @@ public IssueDetailDto showIssue(Long id) {
         UploadedFileDto file = getFileByIssue(issue);
         List<Label> labels = getIssueLabels(id);
         List<SimpleMemberDto> assignees = getIssueAssignees(id);
-        List<CommentDetailDto> comments = getCommentDetails(id);
+        List<CommentDetailDto> comments = commentService.getCommentDetails(id);
 
         return IssueMapper.toIssueDetailDto(issue, writer, milestone, file, labels, assignees, comments);
     }
@@ -52,29 +50,6 @@ private SimpleMemberDto getWriter(String memberId) {
         return memberService.getSimpleMemberById(memberId);
     }
 
-    private List<CommentDetailDto> getCommentDetails(Long id) {
-        List<CommentDetailDto> commentDetails = new ArrayList<>();
-        List<Comment> comments = commentService.findCommentsById(id);
-        addCommentDetail(comments, commentDetails);
-        return commentDetails;
-    }
-
-    private void addCommentDetail(List<Comment> comments, List<CommentDetailDto> commentDetails) {
-        for (Comment comment : comments) {
-            SimpleMemberDto writer = memberService.getSimpleMemberById(comment.getMemberId());
-            UploadedFileDto file = getFileByComment(comment);
-            CommentDetailDto commentDetail = CommentDetailDto.builder()
-                    .id(comment.getId())
-                    .content(comment.getContent())
-                    .writer(writer)
-                    .isWriter(comment.isWriter())
-                    .file(file)
-                    .createDate(comment.getCreateDate())
-                    .build();
-            commentDetails.add(commentDetail);
-        }
-    }
-
     private SimpleMilestoneDto getMilestone(Issue issue) {
         Long milestoneId = issue.getMilestoneId();
         if (milestoneId == null) {
@@ -91,14 +66,6 @@ private UploadedFileDto getFileByIssue(Issue issue) {
         return fileService.showFile(fileId);
     }
 
-    private UploadedFileDto getFileByComment(Comment comment) {
-        Long fileId = comment.getFileId();
-        if (fileId == null) {
-            return null;
-        }
-        return fileService.showFile(fileId);
-    }
-
     private List<Label> getIssueLabels(Long id) {
         List<Long> issueLabelIds = issueQueryService.findLabelIdsByIssueId(id);
         return labelService.findLabelsByIds(issueLabelIds);