diff --git a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/controller/FarmClubController.java b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/controller/FarmClubController.java
index e673b2cc..958bedf9 100644
--- a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/controller/FarmClubController.java
+++ b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/controller/FarmClubController.java
@@ -80,10 +80,11 @@ public BaseResponseDto<?> getMyFarmClub(
 
     @PostMapping("/mission")
     public BaseResponseDto<?> createMissionPost(
+            @AuthenticationPrincipal CustomUser user,
             @RequestPart CreateMissionPostRequestDto requestDto,
             @RequestPart(value = "image") MultipartFile image
     ) {
-        return BaseResponseDto.of(SuccessCode.CREATED, missionPostService.createMissionPost(requestDto, image));
+        return BaseResponseDto.of(SuccessCode.CREATED, missionPostService.createMissionPost(user.getUserId(), requestDto, image));
     }
 
     @PostMapping("/mission/comment")
diff --git a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/dto/req/CreateMissionPostRequestDto.java b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/dto/req/CreateMissionPostRequestDto.java
index 3447f961..8ab9bdc6 100644
--- a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/dto/req/CreateMissionPostRequestDto.java
+++ b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/dto/req/CreateMissionPostRequestDto.java
@@ -5,12 +5,11 @@
 
 public record CreateMissionPostRequestDto(
         // 사진, 내용, 스텝번호
-        Long userFarmClubId,
-        String content,
-        Long stepNum
+        Long farmClubId,
+        String content
 ) {
 
-    public MissionPost toEntity(UserFarmClub userFarmClub, String imageUrl) {
-        return MissionPost.createMissionPost(this.content, this.stepNum, imageUrl, userFarmClub);
+    public MissionPost toEntity(UserFarmClub userFarmClub, String imageUrl, int stepNum) {
+        return MissionPost.createMissionPost(this.content, stepNum, imageUrl, userFarmClub);
     }
 }
diff --git a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/entity/MissionPost.java b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/entity/MissionPost.java
index fa0da170..07061178 100644
--- a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/entity/MissionPost.java
+++ b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/entity/MissionPost.java
@@ -24,7 +24,7 @@ public class MissionPost extends BaseEntity {
     private String content;
 
     @Column(nullable = false)
-    private Long stepNum;
+    private int stepNum;
 
     @Column(nullable = false)
     private String image;
@@ -41,7 +41,7 @@ public class MissionPost extends BaseEntity {
     @JoinColumn(name = "user_farm_club_id")
     private UserFarmClub userFarmClub;
 
-    public static MissionPost createMissionPost(String content, Long stepNum, String image, UserFarmClub userFarmClub){
+    public static MissionPost createMissionPost(String content, int stepNum, String image, UserFarmClub userFarmClub){
         MissionPost newMissionPost = MissionPost.builder()
                 .content(content)
                 .stepNum(stepNum)
diff --git a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/service/MissionPostService.java b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/service/MissionPostService.java
index e3ab53fe..effdb8ae 100644
--- a/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/service/MissionPostService.java
+++ b/src/main/java/com/modernfarmer/farmusspring/domain/farmclub/service/MissionPostService.java
@@ -36,10 +36,10 @@ public class MissionPostService {
     private final S3Service s3Service;
 
     @Transactional
-    public CreateMissionPostResponseDto createMissionPost(CreateMissionPostRequestDto request, MultipartFile image) {
-        UserFarmClub userFarmClub = userFarmClubHelper.getUserFarmClubEntity(request.userFarmClubId());
+    public CreateMissionPostResponseDto createMissionPost(Long userId, CreateMissionPostRequestDto request, MultipartFile image) {
+        UserFarmClub userFarmClub = userFarmClubHelper.findByUserIdAndFarmClubId(userId, request.farmClubId());
         String imageUrl = s3Service.uploadImage(image, "mission-post");
-        MissionPost missionPost = saveMissionPost(request.toEntity(userFarmClub, imageUrl));
+        MissionPost missionPost = saveMissionPost(request.toEntity(userFarmClub, imageUrl, userFarmClub.getCurrentStep()));
         userFarmClub.addMissionPost(missionPost);
         userFarmClub.updateStep(veggieInfoHelper.getStepName(userFarmClub.getFarmClub().getVeggieInfoId(), userFarmClub.getCurrentStep() + 1));
         return CreateMissionPostResponseDto.of(missionPost.getId());
diff --git a/src/main/java/com/modernfarmer/farmusspring/domain/history/vo/MissionPostHistoryVo.java b/src/main/java/com/modernfarmer/farmusspring/domain/history/vo/MissionPostHistoryVo.java
index d1eb0a3f..27544325 100644
--- a/src/main/java/com/modernfarmer/farmusspring/domain/history/vo/MissionPostHistoryVo.java
+++ b/src/main/java/com/modernfarmer/farmusspring/domain/history/vo/MissionPostHistoryVo.java
@@ -7,7 +7,7 @@
 
 @Builder(access = AccessLevel.PRIVATE)
 public record MissionPostHistoryVo(
-        Long stepNum,
+        int stepNum,
         String image,
         String content,
         String date
@@ -17,7 +17,7 @@ public record MissionPostHistoryVo(
     public MissionPostHistoryVo {
     }
 
-    public static MissionPostHistoryVo of(Long stepNum, String image, String content, String date) {
+    public static MissionPostHistoryVo of(int stepNum, String image, String content, String date) {
         return MissionPostHistoryVo.builder()
                 .stepNum(stepNum)
                 .image(image)