diff --git a/src/main/java/balancetalk/global/config/RedisConfig.java b/src/main/java/balancetalk/global/config/RedisConfig.java
index 435f326ed..9d940e1f2 100644
--- a/src/main/java/balancetalk/global/config/RedisConfig.java
+++ b/src/main/java/balancetalk/global/config/RedisConfig.java
@@ -7,6 +7,9 @@
 import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.data.redis.repository.configuration.EnableRedisRepositories;
+import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
+import org.springframework.data.redis.serializer.RedisSerializer;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
 
 @Configuration
 @EnableRedisRepositories
@@ -27,6 +30,16 @@ public RedisConnectionFactory redisConnectionFactory() {
     public RedisTemplate<?, ?> redisTemplate() {
         RedisTemplate<byte[], byte[]> redisTemplate = new RedisTemplate<>();
         redisTemplate.setConnectionFactory(redisConnectionFactory());
+
+        redisTemplate.setKeySerializer(new StringRedisSerializer());
+        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
+        redisTemplate.setDefaultSerializer(new StringRedisSerializer());
+        redisTemplate.afterPropertiesSet();
         return redisTemplate;
     }
+
+    @Bean
+    public RedisSerializer<Object> springSessionDefaultRedisSerializer() {
+        return new GenericJackson2JsonRedisSerializer();
+    }
 }
diff --git a/src/main/java/balancetalk/global/exception/ErrorCode.java b/src/main/java/balancetalk/global/exception/ErrorCode.java
index e7d0aa430..debc6c7c2 100644
--- a/src/main/java/balancetalk/global/exception/ErrorCode.java
+++ b/src/main/java/balancetalk/global/exception/ErrorCode.java
@@ -55,6 +55,7 @@ public enum ErrorCode {
     NOT_FOUND_MEMBER(NOT_FOUND, "존재하지 않는 회원입니다."),
     NOT_FOUND_VOTE(NOT_FOUND, "해당 게시글에서 투표한 기록이 존재하지 않습니다."),
     NOT_FOUND_BOOKMARK(NOT_FOUND, "해당 게시글에서 북마크한 기록이 존재하지 않습니다."),
+    NOT_FOUND_POST_LIKE(NOT_FOUND, "해당 게시글을 추천한 기록이 존재하지 않습니다. "),
     NOT_FOUND_COMMENT(NOT_FOUND, "존재하지 않는 댓글입니다."),
     NOT_FOUND_DIRECTORY(NOT_FOUND, "존재하지 않는 디렉토리입니다."),
     NOT_SUPPORTED_FILE_TYPE(NOT_FOUND, "지원하지 않는 파일 형식입니다."),
diff --git a/src/main/java/balancetalk/global/jwt/JwtAuthenticationFilter.java b/src/main/java/balancetalk/global/jwt/JwtAuthenticationFilter.java
index 02cf5f810..be150ed6f 100644
--- a/src/main/java/balancetalk/global/jwt/JwtAuthenticationFilter.java
+++ b/src/main/java/balancetalk/global/jwt/JwtAuthenticationFilter.java
@@ -28,9 +28,6 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
                 Authentication auth = jwtTokenProvider.getAuthentication(token);
                 SecurityContextHolder.getContext().setAuthentication(auth);
             }
-            else if (token == null) {
-                throw new BalanceTalkException(ErrorCode.EMPTY_JWT_TOKEN);
-            }
         } catch (Exception e) {
             log.error("error={}", e.getMessage());
             request.setAttribute("exception", e.getMessage());
diff --git a/src/main/java/balancetalk/module/comment/domain/Comment.java b/src/main/java/balancetalk/module/comment/domain/Comment.java
index eb6798696..8be674fb5 100644
--- a/src/main/java/balancetalk/module/comment/domain/Comment.java
+++ b/src/main/java/balancetalk/module/comment/domain/Comment.java
@@ -46,6 +46,9 @@ public class Comment extends BaseTimeEntity {
     @JoinColumn(name = "parent_id")
     private Comment parent;
 
+    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
+    private List<Comment> replies = new ArrayList<>();
+
     @OneToMany(mappedBy = "comment", cascade = CascadeType.ALL)
     private List<CommentLike> likes = new ArrayList<>();
 
diff --git a/src/main/java/balancetalk/module/comment/dto/CommentResponse.java b/src/main/java/balancetalk/module/comment/dto/CommentResponse.java
index 77e9f5d36..c0dc8f7f2 100644
--- a/src/main/java/balancetalk/module/comment/dto/CommentResponse.java
+++ b/src/main/java/balancetalk/module/comment/dto/CommentResponse.java
@@ -43,6 +43,9 @@ public class CommentResponse {
     @Schema(description = "추천 여부", example = "true")
     private boolean myLike;
 
+    @Schema(description = "답글 수", example = "3")
+    private int replyCount;
+
     @Schema(description = "댓글 생성 날짜")
     private LocalDateTime createdAt;
 
@@ -63,6 +66,7 @@ public static CommentResponse fromEntity(Comment comment, Long balanceOptionId,
                 .likesCount(comment.getLikes().size())
                 //.reportedCount(comment.reportedCount())
                 .myLike(myLike)
+                .replyCount(comment.getReplies().size())
                 .createdAt(comment.getCreatedAt())
                 .lastModifiedAt(comment.getLastModifiedAt())
                 .profileImageUrl(getProfileImageUrl(comment.getMember()))
diff --git a/src/main/java/balancetalk/module/post/application/PostService.java b/src/main/java/balancetalk/module/post/application/PostService.java
index b1756e446..1669111d6 100644
--- a/src/main/java/balancetalk/module/post/application/PostService.java
+++ b/src/main/java/balancetalk/module/post/application/PostService.java
@@ -92,7 +92,7 @@ public Page<PostResponse> findAll(String token, Pageable pageable) {
                 member.hasVoted(post)));
     }
 
-    @Transactional(readOnly = true)
+    @Transactional
     public PostResponse findById(Long postId, String token) {
         Post post = getCurrentPost(postId);
 
@@ -152,6 +152,7 @@ public Long likePost(Long postId) {
             throw new BalanceTalkException(ALREADY_LIKE_POST);
         }
 
+
         PostLike postLike = PostLike.builder()
                 .post(post)
                 .member(member)
@@ -164,12 +165,15 @@ public Long likePost(Long postId) {
     public void cancelLikePost(Long postId) {
         Post post = getCurrentPost(postId);
         Member member = getCurrentMember(memberRepository);
-        if (post.likesCount() == 0) {
-            throw new BalanceTalkException(ALREADY_CANCEL_LIKE_POST);
+        if (notExistsPostLikeBy(member, post)) {
+            throw new BalanceTalkException(NOT_FOUND_POST_LIKE);
         }
         postLikeRepository.deleteByMemberAndPost(member, post);
     }
 
+    private boolean notExistsPostLikeBy(Member member, Post post) {
+        return !postLikeRepository.existsByMemberAndPost(member, post);
+    }
     private Post getCurrentPost(Long postId) {
         return postRepository.findById(postId)
                 .orElseThrow(() -> new BalanceTalkException(NOT_FOUND_POST));
diff --git a/src/main/java/balancetalk/module/post/domain/PostRepository.java b/src/main/java/balancetalk/module/post/domain/PostRepository.java
index 185dc6dad..075da36cf 100644
--- a/src/main/java/balancetalk/module/post/domain/PostRepository.java
+++ b/src/main/java/balancetalk/module/post/domain/PostRepository.java
@@ -19,10 +19,10 @@ public interface PostRepository extends JpaRepository<Post, Long> {
 
     List<Post> findByTitleContaining(String keyword);
 
-    @Query(value = "SELECT * " +
-            "FROM post p " +
-            "NATURAL JOIN post_tag pt " +
-            "NATURAL JOIN tag t " +
-            "WHERE p.post_id = pt.post_id AND pt.tag_id = t.tag_id AND t.name = :tagName", nativeQuery = true)
+    @Query("SELECT p " +
+            "FROM Post p " +
+            "JOIN p.postTags pt " +
+            "JOIN pt.tag t " +
+            "WHERE t.name = :tagName")
     List<Post> findByPostTagsContaining(String tagName);
 }