diff --git a/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/CommentResponseDto.kt b/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/CommentResponseDto.kt
index d0a67c19..da4fd74c 100644
--- a/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/CommentResponseDto.kt
+++ b/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/CommentResponseDto.kt
@@ -2,11 +2,13 @@ package io.csbroker.apiserver.controller.v1.post.response
 
 import io.csbroker.apiserver.model.Comment
 import java.time.LocalDateTime
+import java.util.UUID
 
 data class CommentResponseDto(
     val id: Long,
     val content: String,
     val username: String,
+    val userId: UUID,
     val likeCount: Long,
     val isLiked: Boolean,
     val createdAt: LocalDateTime,
@@ -14,6 +16,7 @@ data class CommentResponseDto(
     constructor(comment: Comment, likeCount: Long, isLiked: Boolean) : this(
         id = comment.id,
         content = comment.content,
+        userId = comment.user.id!!,
         username = comment.user.username,
         likeCount = likeCount,
         isLiked = isLiked,
diff --git a/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/PostResponseDto.kt b/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/PostResponseDto.kt
index bc05cb2c..d4e7088d 100644
--- a/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/PostResponseDto.kt
+++ b/src/main/kotlin/io/csbroker/apiserver/controller/v1/post/response/PostResponseDto.kt
@@ -1,11 +1,13 @@
 package io.csbroker.apiserver.controller.v1.post.response
 
 import io.csbroker.apiserver.model.Post
+import java.util.UUID
 
 data class PostResponseDto(
     val id: Long,
     val content: String,
     val username: String,
+    val userId: UUID,
     val likeCount: Long,
     val isLiked: Boolean,
     val comments: List<CommentResponseDto>,
@@ -13,9 +15,10 @@ data class PostResponseDto(
     constructor(post: Post, likeCount: Long, isLiked: Boolean, comments: List<CommentResponseDto>) : this(
         id = post.id,
         content = post.content,
+        userId = post.user.id!!,
         username = post.user.username,
         likeCount = likeCount,
         isLiked = isLiked,
-        comments = comments,
+        comments = comments.sortedBy { it.createdAt },
     )
 }
diff --git a/src/test/kotlin/io/csbroker/apiserver/controller/v1/post/PostControllerTest.kt b/src/test/kotlin/io/csbroker/apiserver/controller/v1/post/PostControllerTest.kt
index fd83f36f..cfc687de 100644
--- a/src/test/kotlin/io/csbroker/apiserver/controller/v1/post/PostControllerTest.kt
+++ b/src/test/kotlin/io/csbroker/apiserver/controller/v1/post/PostControllerTest.kt
@@ -18,6 +18,7 @@ import org.springframework.restdocs.payload.JsonFieldType
 import org.springframework.restdocs.payload.PayloadDocumentation
 import org.springframework.restdocs.request.RequestDocumentation
 import java.time.LocalDateTime
+import java.util.UUID
 
 class PostControllerTest : RestDocsTest() {
     private lateinit var postService: PostService
@@ -101,6 +102,7 @@ class PostControllerTest : RestDocsTest() {
                 1L,
                 "CONTENT",
                 "USER",
+                UUID.randomUUID(),
                 1,
                 true,
                 listOf(
@@ -108,6 +110,7 @@ class PostControllerTest : RestDocsTest() {
                         1L,
                         "CONTENT",
                         "USER",
+                        UUID.randomUUID(),
                         1,
                         true,
                         LocalDateTime.now(),
@@ -138,6 +141,8 @@ class PostControllerTest : RestDocsTest() {
                             .type(JsonFieldType.STRING).description("글 내용"),
                         PayloadDocumentation.fieldWithPath("data[].username")
                             .type(JsonFieldType.STRING).description("작성자"),
+                        PayloadDocumentation.fieldWithPath("data[].userId")
+                            .type(JsonFieldType.STRING).description("작성자 ID"),
                         PayloadDocumentation.fieldWithPath("data[].likeCount")
                             .type(JsonFieldType.NUMBER).description("좋아요 수"),
                         PayloadDocumentation.fieldWithPath("data[].isLiked")
@@ -148,6 +153,8 @@ class PostControllerTest : RestDocsTest() {
                             .type(JsonFieldType.STRING).description("댓글 내용"),
                         PayloadDocumentation.fieldWithPath("data[].comments[].username")
                             .type(JsonFieldType.STRING).description("댓글 작성자"),
+                        PayloadDocumentation.fieldWithPath("data[].comments[].userId")
+                            .type(JsonFieldType.STRING).description("댓글 작성자 ID"),
                         PayloadDocumentation.fieldWithPath("data[].comments[].likeCount")
                             .type(JsonFieldType.NUMBER).description("좋아요 수"),
                         PayloadDocumentation.fieldWithPath("data[].comments[].isLiked")