diff --git a/src/main/java/com/devin/dev/controller/post/PostController.java b/src/main/java/com/devin/dev/controller/post/PostController.java
index df9a272..68a9a18 100644
--- a/src/main/java/com/devin/dev/controller/post/PostController.java
+++ b/src/main/java/com/devin/dev/controller/post/PostController.java
@@ -3,7 +3,6 @@
 import com.devin.dev.controller.reply.ReplyOrderCondition;
 import com.devin.dev.dto.post.PostDetailsDto;
 import com.devin.dev.model.DefaultResponse;
-import com.devin.dev.security.JwtAuthTokenProvider;
 import com.devin.dev.service.PostService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Sort;
@@ -52,6 +51,12 @@ public DefaultResponse<PostDetailsDto> deletePost(@PathVariable("id") Long postI
 
     @PostMapping("/post")
     public DefaultResponse<?> post(@RequestBody PostForm form, HttpServletRequest request) {
-        return postService.post(request, form);
+        return postService.post(form, request);
     }
+
+    @PatchMapping("/post/{id}/like")
+    public DefaultResponse<?> changePostLike(@PathVariable("id") Long postId, HttpServletRequest request) {
+        return postService.changePostLike(postId, request);
+    }
+
 }
diff --git a/src/main/java/com/devin/dev/entity/post/PostLike.java b/src/main/java/com/devin/dev/entity/post/PostLike.java
index bd3d1f0..89459a7 100644
--- a/src/main/java/com/devin/dev/entity/post/PostLike.java
+++ b/src/main/java/com/devin/dev/entity/post/PostLike.java
@@ -1,14 +1,16 @@
 package com.devin.dev.entity.post;
 
 import com.devin.dev.entity.base.Created;
+import com.devin.dev.entity.user.User;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 import javax.persistence.*;
 
 @Entity
-@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@NoArgsConstructor
 @Getter
 public class PostLike extends Created {
 
@@ -21,4 +23,17 @@ public class PostLike extends Created {
     @JoinColumn(name = "post_id")
     private Post post;
 
+    @Setter
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    public void changePost(Post post) {
+        if(this.post != null) {
+            this.post.getLikes().remove(this);
+        } else {
+            this.post = post;
+            post.getLikes().add(this);
+        }
+    }
 }
diff --git a/src/main/java/com/devin/dev/repository/post/PostLikeRepository.java b/src/main/java/com/devin/dev/repository/post/PostLikeRepository.java
index 7d9fcf0..203dd39 100644
--- a/src/main/java/com/devin/dev/repository/post/PostLikeRepository.java
+++ b/src/main/java/com/devin/dev/repository/post/PostLikeRepository.java
@@ -1,7 +1,14 @@
 package com.devin.dev.repository.post;
 
+import com.devin.dev.entity.post.Post;
 import com.devin.dev.entity.post.PostLike;
+import com.devin.dev.entity.user.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.util.List;
+import java.util.Optional;
+
 public interface PostLikeRepository extends JpaRepository<PostLike, Long> {
+
+    Optional<PostLike> findByPostAndUser(Post post, User user);
 }
diff --git a/src/main/java/com/devin/dev/repository/post/PostRepositoryQueryImpl.java b/src/main/java/com/devin/dev/repository/post/PostRepositoryQueryImpl.java
index 2027333..8ab6408 100644
--- a/src/main/java/com/devin/dev/repository/post/PostRepositoryQueryImpl.java
+++ b/src/main/java/com/devin/dev/repository/post/PostRepositoryQueryImpl.java
@@ -125,9 +125,9 @@ public Optional<PostDetailsDto> findPostDetailsById(Long id, ReplyOrderCondition
         Post result = queryFactory
                 .select(post)
                 .from(post)
-                .innerJoin(post.replies, reply).fetchJoin()
-                .innerJoin(post.user, user).fetchJoin()
-                .innerJoin(reply.user, user).fetchJoin()
+                .leftJoin(post.replies, reply).fetchJoin()
+                .leftJoin(post.user, user).fetchJoin()
+                .leftJoin(reply.user, user).fetchJoin()
                 .where(post.id.eq(id))
                 .orderBy(
                         replyOrder(condition)
diff --git a/src/main/java/com/devin/dev/service/PostService.java b/src/main/java/com/devin/dev/service/PostService.java
index d92de63..5bd7484 100644
--- a/src/main/java/com/devin/dev/service/PostService.java
+++ b/src/main/java/com/devin/dev/service/PostService.java
@@ -210,6 +210,60 @@ public DefaultResponse<PostDetailsDto> deletePost(Long postId) {
 
         return new DefaultResponse<>(StatusCode.SUCCESS, ResponseMessage.DELETED_POST);
     }
+
+    public DefaultResponse<?> changePostLike(Long postId, HttpServletRequest request) {
+        String token = tokenProvider.parseToken(request);
+        Long userId;
+        if (tokenProvider.validateToken(token)) {
+            userId = tokenProvider.getUserId(token);
+        } else {
+            return new DefaultResponse<>(StatusCode.FAIL_AUTH, ResponseMessage.NOT_FOUND_USER);
+        }
+        Optional<User> userOptional = userRepository.findById(userId);
+        if (userOptional.isEmpty()) {
+            return new DefaultResponse<>(StatusCode.NOT_EXIST, ResponseMessage.NOT_FOUND_USER);
+        }
+        User user = userOptional.get();
+
+        Optional<Post> postOptional = postRepository.findById(postId);
+        if (postOptional.isEmpty()) {
+            return new DefaultResponse<>(StatusCode.NOT_EXIST, ResponseMessage.NOT_FOUND_POST);
+        }
+        Post post = postOptional.get();
+
+        Optional<PostLike> likeOptional = postLikeRepository.findByPostAndUser(post, user);
+
+        PostLike postLike;
+        // 추천 유무에 따라 실행
+        if (likeOptional.isPresent()) {
+            postLike = likeOptional.get();
+            postLikeRepository.delete(postLike);
+            if (isNotSameUser(user, post.getUser())) {
+                // 좋아요 누른 사람 경험치 감소
+                user.changeExp(User.ExpChangeType.REPLY_CANCEL_LIKE);
+                // 답변 작성자 경험치 감소
+                post.getUser().changeExp(User.ExpChangeType.REPLY_NOT_BE_LIKED);
+            }
+        } else {
+            postLike = post.like(user, new PostLike());
+            if (isNotSameUser(user, post.getUser())) {
+                // 좋아요 누른 사람 경험치 증가
+                user.changeExp(User.ExpChangeType.REPLY_LIKE);
+                // 답변 작성자 경험치 증가
+                post.getUser().changeExp(User.ExpChangeType.REPLY_BE_LIKED);
+            }
+            postLikeRepository.save(postLike);
+        }
+
+        ReplyLikeDto replyLikeDto = new ReplyLikeDto(postLike.getId(), user.getName());
+
+        return new DefaultResponse<>(StatusCode.SUCCESS, ResponseMessage.REPLY_LIKE_CHANGE_SUCCESS, replyLikeDto);
+
+    }
+
+    private boolean isNotSameUser(User firstUser, User secondUser) {
+        return !firstUser.getId().equals(secondUser.getId());
+    }
 }