diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/controller/AnimalMissionController.java b/src/main/java/com/pbl/insaroad/domain/animalmission/controller/AnimalMissionController.java
index b283200..abc9572 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/controller/AnimalMissionController.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/controller/AnimalMissionController.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.controller;
 
 import jakarta.validation.Valid;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Crane.java b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Crane.java
index d284a4e..9c3061b 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Crane.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Crane.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.data;
 
 import java.util.Arrays;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Haetae.java b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Haetae.java
index 5c98137..5edd0f6 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Haetae.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Haetae.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.data;
 
 import java.util.Arrays;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Magpie.java b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Magpie.java
index 02ba9f7..830d5bb 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Magpie.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Magpie.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.data;
 
 import java.util.Arrays;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Tiger.java b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Tiger.java
index 32a7da5..ac51eb6 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Tiger.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Tiger.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.data;
 
 import java.util.Arrays;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Turtle.java b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Turtle.java
index c12cd08..cc99b5f 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/data/Turtle.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/data/Turtle.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.data;
 
 import java.util.Arrays;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/request/AnimalMissionSubmitRequest.java b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/request/AnimalMissionSubmitRequest.java
index 914314f..e1bd5ee 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/request/AnimalMissionSubmitRequest.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/request/AnimalMissionSubmitRequest.java
@@ -1,7 +1,11 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.dto.request;
 
 import java.util.List;
 
+import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
 
@@ -18,6 +22,10 @@
 @Schema(description = "동물 미션 테스트 결과 제출 요청")
 public class AnimalMissionSubmitRequest {
 
+  @NotBlank(message = "사용자 코드는 필수입니다.")
+  @Schema(description = "사용자 코드 (3자리)", example = "123")
+  private String userCode;
+
   @NotNull @Size(min = 2, max = 2, message = "문양은 2개를 선택해야 합니다.")
   @Schema(description = "문양 선택 (2개)", example = "[\"TIGER\", \"CRANE\"]")
   private List<AnimalType> patternAnimals;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/DescriptionResponse.java b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/DescriptionResponse.java
index 03a1bee..a04d65a 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/DescriptionResponse.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/DescriptionResponse.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.dto.response;
 
 import java.util.List;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/ResultTextSegment.java b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/ResultTextSegment.java
index ec6fba5..36945fb 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/ResultTextSegment.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/dto/response/ResultTextSegment.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.dto.response;
 
 import io.swagger.v3.oas.annotations.media.Schema;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/entity/AnimalType.java b/src/main/java/com/pbl/insaroad/domain/animalmission/entity/AnimalType.java
index 297510e..60d999a 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/entity/AnimalType.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/entity/AnimalType.java
@@ -1,3 +1,6 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.entity;
 
 import lombok.Getter;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/exception/AnimalMissionErrorCode.java b/src/main/java/com/pbl/insaroad/domain/animalmission/exception/AnimalMissionErrorCode.java
index 4906d59..e61a0f5 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/exception/AnimalMissionErrorCode.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/exception/AnimalMissionErrorCode.java
@@ -1,6 +1,10 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.exception;
 
 import org.springframework.http.HttpStatus;
+
 import com.pbl.insaroad.global.exception.model.BaseErrorCode;
 
 import lombok.AllArgsConstructor;
@@ -10,6 +14,8 @@
 @AllArgsConstructor
 public enum AnimalMissionErrorCode implements BaseErrorCode {
   DUPLICATE_PATTERN_ANIMALS("ANIMAL_4001", "patternAnimals에 중복된 동물이 있습니다.", HttpStatus.BAD_REQUEST),
+  USER_NOT_FOUND("ANIMAL_4002", "사용자를 찾을 수 없습니다.", HttpStatus.NOT_FOUND),
+  USER_NOT_STAGE_3("ANIMAL_4003", "사용자의 스테이지가 3이 아닙니다.", HttpStatus.BAD_REQUEST),
   ;
 
   private final String code;
diff --git a/src/main/java/com/pbl/insaroad/domain/animalmission/service/AnimalMissionService.java b/src/main/java/com/pbl/insaroad/domain/animalmission/service/AnimalMissionService.java
index 7f1cbcc..12017da 100644
--- a/src/main/java/com/pbl/insaroad/domain/animalmission/service/AnimalMissionService.java
+++ b/src/main/java/com/pbl/insaroad/domain/animalmission/service/AnimalMissionService.java
@@ -1,8 +1,12 @@
+/* 
+ * Copyright (c) SKU PBL Team4 
+ */
 package com.pbl.insaroad.domain.animalmission.service;
 
 import java.util.*;
 
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import com.pbl.insaroad.domain.animalmission.data.Crane;
 import com.pbl.insaroad.domain.animalmission.data.Haetae;
@@ -13,14 +17,21 @@
 import com.pbl.insaroad.domain.animalmission.dto.response.AnimalResultResponse;
 import com.pbl.insaroad.domain.animalmission.entity.AnimalType;
 import com.pbl.insaroad.domain.animalmission.exception.AnimalMissionErrorCode;
+import com.pbl.insaroad.domain.user.entity.User;
+import com.pbl.insaroad.domain.user.repository.UserRepository;
 import com.pbl.insaroad.global.exception.CustomException;
 
+import lombok.RequiredArgsConstructor;
+
 @Service
+@RequiredArgsConstructor
 public class AnimalMissionService {
 
   // 동물 타입별 결과 응답을 저장하는 Map
   private static final Map<AnimalType, AnimalResultResponse> ANIMAL_RESULTS = new HashMap<>();
 
+  private final UserRepository userRepository;
+
   static {
     ANIMAL_RESULTS.put(AnimalType.TIGER, Tiger.CONTENT);
     ANIMAL_RESULTS.put(AnimalType.MAGPIE, Magpie.CONTENT);
@@ -30,10 +41,22 @@ public class AnimalMissionService {
   }
 
   // 동물 미션 제출 처리 메서드
+  @Transactional
   public AnimalResultResponse submitAnimalMission(AnimalMissionSubmitRequest request) {
     // 0. patternAnimals 중복 검증
     validateNoDuplicatePatternAnimals(request.getPatternAnimals());
 
+    // 사용자 조회
+    User user =
+        userRepository
+            .findByCode(request.getUserCode())
+            .orElseThrow(() -> new CustomException(AnimalMissionErrorCode.USER_NOT_FOUND));
+
+    // 사용자 스테이지 검증
+    if (user.getStage() != 3) {
+      throw new CustomException(AnimalMissionErrorCode.USER_NOT_STAGE_3);
+    }
+
     // 1. 동물별 점수 집계
     Map<AnimalType, Integer> scoreMap = calculateScores(request);
 
@@ -57,6 +80,10 @@ public AnimalResultResponse submitAnimalMission(AnimalMissionSubmitRequest reque
               .orElse(request.getPaintingAnimal());
     }
 
+    // 스테이지가 3이면 미션 완료 처리
+    user.completeMission();
+    userRepository.save(user);
+
     return ANIMAL_RESULTS.get(resultAnimal);
   }