diff --git a/.env b/.env
index 5e6d4ad..3c536f1 100644
--- a/.env
+++ b/.env
@@ -1,8 +1,8 @@
 SPRING_PROFILES_ACTIVE=local
 # prod에서 local로 변경
-LOCAL_DB_URL=jdbc:mysql://localhost:3306/cokerthon-local?serverTimezone=Asia/Seoul&characterEncoding=UTF-8&createDatabaseIfNotExist=true
+LOCAL_DB_URL=jdbc:mysql://localhost:3306/cokerthon
 LOCAL_DB_USERNAME=root
-LOCAL_DB_PASSWORD=dlgodnjs!
+LOCAL_DB_PASSWORD=1234
 PROD_DB_URL=jdbc:mysql://cokerthon-db.clgeccwgurgu.ap-northeast-2.rds.amazonaws.com:3306/cokathon?serverTimezone=Asia/Seoul&characterEncoding=UTF-8
 PROD_DB_USERNAME=admin
 PROD_DB_PASSWORD=cokerthonpassword
\ No newline at end of file
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/controller/EmotionController.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/controller/EmotionController.java
new file mode 100644
index 0000000..667aeb4
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/controller/EmotionController.java
@@ -0,0 +1,194 @@
+package com.cokerthon.Team3_Backend.domain.emotion.controller;
+
+import com.cokerthon.Team3_Backend.domain.emotion.converter.EmotionConverter;
+import com.cokerthon.Team3_Backend.domain.emotion.dto.request.EmotionRequestDto;
+import com.cokerthon.Team3_Backend.domain.emotion.dto.response.EmotionResponseDto;
+import com.cokerthon.Team3_Backend.domain.emotion.entity.EmotionRecord;
+import com.cokerthon.Team3_Backend.domain.emotion.exception.code.EmotionSuccessCode;
+import com.cokerthon.Team3_Backend.domain.emotion.service.command.EmotionCommandService;
+import com.cokerthon.Team3_Backend.domain.user.entity.User;
+import com.cokerthon.Team3_Backend.domain.user.repository.UserRepository;
+import com.cokerthon.Team3_Backend.global.apiPayload.ApiResponse;
+import com.cokerthon.Team3_Backend.global.apiPayload.code.GeneralErrorCode;
+import com.cokerthon.Team3_Backend.global.exception.GeneralException;
+import com.cokerthon.Team3_Backend.global.security.CurrentUser;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.servlet.http.HttpSession;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@Tag(
+        name = "Emotion",
+        description = "감정 기록 생성·수정·삭제 API"
+)
+@RestController
+@RequestMapping("/api/emotions")
+@RequiredArgsConstructor
+public class EmotionController {
+
+    private final EmotionCommandService emotionCommandService;
+    private final UserRepository userRepository;
+
+    /**
+     * 감정 생성 API
+     * @param requestDto EmotionCreateRequestDto
+     * @param user 로그인 된 사용자 엔티티
+     * @return 감정 생성 완료 응답
+     */
+    @Operation(
+            summary = "감정 기록 생성 by 임준서(개발 완료)",
+            description = """
+        현재 로그인한 사용자가 감정 기록을 생성합니다.
+
+        - 감정 점수는 1~5 사이 값만 허용됩니다.
+        - visibility = PUBLIC 인 경우 다른 사용자에게 공개됩니다.
+        """
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "200",
+                    description = "감정 기록 생성 성공"
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "400",
+                    description = "잘못된 요청 (감정 점수 범위 오류 등)",
+                    content = @Content
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "401",
+                    description = "로그인되지 않은 사용자",
+                    content = @Content
+            )
+    })
+    @PostMapping
+    public ResponseEntity<ApiResponse<EmotionResponseDto.EmotionCreateResponseDto>> createEmotion(
+            @RequestBody EmotionRequestDto.EmotionCreateRequestDto requestDto,
+            @CurrentUser User user
+    ) {
+        EmotionRecord emotion =
+                emotionCommandService.createEmotion(user, requestDto);
+
+        return ResponseEntity.ok(
+                ApiResponse.onSuccess(
+                        EmotionSuccessCode.EMOTION_CREATED,
+                        EmotionConverter.toCreateResponse(emotion)
+                )
+        );
+    }
+
+    /**
+     * 감정 수정 API
+     * @param emotionId 감정 기록 ID
+     * @param requestDto EmotionUpdateRequestDto
+     * @param user 로그인 된 사용자 엔티티
+     * @return 감정 수정 완료 응답
+     */
+    @Operation(
+            summary = "감정 기록 수정 by 임준서(개발 완료)",
+            description = """
+        기존에 작성한 감정 기록을 수정합니다.
+
+        - 작성자 본인만 수정할 수 있습니다.
+        - 감정 점수는 1~5 사이 값만 허용됩니다.
+        """
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "200",
+                    description = "감정 기록 수정 성공"
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "403",
+                    description = "작성자가 아닌 경우",
+                    content = @Content
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "404",
+                    description = "감정 기록을 찾을 수 없음",
+                    content = @Content
+            )
+    })
+    @PutMapping("/{emotionId}")
+    public ResponseEntity<ApiResponse<EmotionResponseDto.EmotionUpdateResponseDto>> updateEmotion(
+            @PathVariable Long emotionId,
+            @RequestBody EmotionRequestDto.EmotionUpdateRequestDto requestDto,
+            @CurrentUser User user
+    ) {
+        emotionCommandService.updateEmotion(
+                emotionId,
+                user,
+                requestDto
+        );
+
+        return ResponseEntity.ok(
+                ApiResponse.onSuccess(
+                        EmotionSuccessCode.EMOTION_UPDATED,
+                        null
+                )
+        );
+    }
+
+    /**
+     * 감정 삭제 API
+     * @param emotionId 감정 기록 ID
+     * @param user 로그인 된 사용자 엔티티
+     * @return 감정 삭제 완료 응답
+     */
+    @Operation(
+            summary = "감정 기록 삭제 by 임준서(개발 완료)",
+            description = """
+        감정 기록을 삭제합니다.
+
+        - 작성자 본인만 삭제할 수 있습니다.
+        - 삭제된 감정 기록은 복구할 수 없습니다.
+        """
+    )
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "200",
+                    description = "감정 기록 삭제 성공"
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "403",
+                    description = "작성자가 아닌 경우",
+                    content = @Content
+            ),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(
+                    responseCode = "404",
+                    description = "감정 기록을 찾을 수 없음",
+                    content = @Content
+            )
+    })
+    @DeleteMapping("/{emotionId}")
+    public ResponseEntity<ApiResponse<Void>> deleteEmotion(
+            @PathVariable Long emotionId,
+            @CurrentUser User user
+    ) {
+
+        emotionCommandService.deleteEmotion(emotionId, user);
+
+        return ResponseEntity.ok(
+                ApiResponse.onSuccess(
+                        EmotionSuccessCode.EMOTION_DELETED,
+                        null
+                )
+        );
+    }
+
+    /* ===== private ===== */
+
+    private User getLoginUser(Long userId) {
+        if (userId == null) {
+            throw new GeneralException(GeneralErrorCode.UNAUTHORIZED);
+        }
+
+        return userRepository.findById(userId)
+                .orElseThrow(() ->
+                        new GeneralException(GeneralErrorCode.UNAUTHORIZED)
+                );
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/converter/EmotionConverter.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/converter/EmotionConverter.java
new file mode 100644
index 0000000..bbd8bbb
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/converter/EmotionConverter.java
@@ -0,0 +1,50 @@
+package com.cokerthon.Team3_Backend.domain.emotion.converter;
+
+import com.cokerthon.Team3_Backend.domain.emotion.dto.request.EmotionRequestDto;
+import com.cokerthon.Team3_Backend.domain.emotion.dto.response.EmotionResponseDto;
+import com.cokerthon.Team3_Backend.domain.emotion.entity.EmotionRecord;
+import com.cokerthon.Team3_Backend.domain.user.entity.User;
+
+public class EmotionConverter {
+
+    private EmotionConverter() {
+    }
+
+    /** 생성 요청 DTO → Entity */
+    public static EmotionRecord toEntity(
+            User user,
+            EmotionRequestDto.EmotionCreateRequestDto dto
+    ) {
+        return EmotionRecord.builder()
+                .user(user)
+                .emotionScore(dto.emotionScore())
+                .content(dto.content())
+                .visibility(dto.visibility()) // 생성 시에만 설정
+                .build();
+    }
+
+    /** 수정 요청 DTO → Entity 반영  */
+    public static void updateEntity(
+            EmotionRecord emotion,
+            EmotionRequestDto.EmotionUpdateRequestDto dto
+    ) {
+        emotion.update(
+                dto.emotionScore(),
+                dto.content()
+        );
+    }
+
+    /** Entity → 생성 응답 DTO */
+    public static EmotionResponseDto.EmotionCreateResponseDto toCreateResponse(
+            EmotionRecord emotion
+    ) {
+        return new EmotionResponseDto.EmotionCreateResponseDto(emotion.getId());
+    }
+
+    /** Entity → 수정 응답 DTO */
+    public static EmotionResponseDto.EmotionUpdateResponseDto toUpdateResponse(
+            EmotionRecord emotion
+    ) {
+        return new EmotionResponseDto.EmotionUpdateResponseDto(emotion.getId());
+    }
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/request/EmotionRequestDto.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/request/EmotionRequestDto.java
new file mode 100644
index 0000000..07e044d
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/request/EmotionRequestDto.java
@@ -0,0 +1,28 @@
+package com.cokerthon.Team3_Backend.domain.emotion.dto.request;
+
+import com.cokerthon.Team3_Backend.domain.emotion.enums.Visibility;
+import io.swagger.v3.oas.annotations.media.Schema;
+
+public class EmotionRequestDto {
+
+    public record EmotionCreateRequestDto(
+            @Schema(description = "감정 점수 (1~5)", example = "4")
+            int emotionScore,
+
+            @Schema(description = "감정 내용", example = "오늘은 기분이 좋다.")
+            String content,
+
+            @Schema(description = "공개 여부", example = "PUBLIC")
+            Visibility visibility
+    ) {
+    }
+
+    public record EmotionUpdateRequestDto(
+            @Schema(description = "감정 점수 (1~5)", example = "4")
+            int emotionScore,
+
+            @Schema(description = "감정 내용", example = "오늘은 기분이 좋다.")
+            String content
+    ) {
+    }
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/response/EmotionResponseDto.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/response/EmotionResponseDto.java
new file mode 100644
index 0000000..696daff
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/dto/response/EmotionResponseDto.java
@@ -0,0 +1,14 @@
+package com.cokerthon.Team3_Backend.domain.emotion.dto.response;
+
+public class EmotionResponseDto {
+
+    public record EmotionCreateResponseDto(
+            Long emotionId
+    ) {
+    }
+
+    public record EmotionUpdateResponseDto(
+            Long emotionId
+    ) {
+    }
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/entity/EmotionRecord.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/entity/EmotionRecord.java
index 91e58e5..d9d3d27 100644
--- a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/entity/EmotionRecord.java
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/entity/EmotionRecord.java
@@ -1,6 +1,6 @@
 package com.cokerthon.Team3_Backend.domain.emotion.entity;
 
-import com.cokerthon.Team3_Backend.domain.emotion.enums.Visiblity;
+import com.cokerthon.Team3_Backend.domain.emotion.enums.Visibility;
 import com.cokerthon.Team3_Backend.domain.user.entity.User;
 import com.cokerthon.Team3_Backend.global.entity.BaseEntity;
 import jakarta.persistence.*;
@@ -44,5 +44,21 @@ public class EmotionRecord extends BaseEntity {
     /** 공개 여부 */
     @Enumerated(EnumType.STRING)
     @Column(nullable = false)
-    private Visiblity visibility;
+    private Visibility visibility;
+
+
+    // == 비즈니스 로직 == //
+
+    /** 감정 수정 */
+    public void update(int emotionScore, String content) {
+        this.emotionScore = emotionScore;
+        this.content = content;
+    }
+
+    /** 작성자 검증 */
+    public void validateOwner(User user) {
+        if (!this.user.getId().equals(user.getId())) {
+            throw new IllegalStateException("작성자만 수정/삭제할 수 있습니다.");
+        }
+    }
 }
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visiblity.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visibility.java
similarity index 77%
rename from src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visiblity.java
rename to src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visibility.java
index b53c1db..e781711 100644
--- a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visiblity.java
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/enums/Visibility.java
@@ -1,6 +1,6 @@
 package com.cokerthon.Team3_Backend.domain.emotion.enums;
 
-public enum Visiblity {
+public enum Visibility {
     PUBLIC,
     PRIVATE
 }
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/EmotionException.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/EmotionException.java
new file mode 100644
index 0000000..7391ccc
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/EmotionException.java
@@ -0,0 +1,10 @@
+package com.cokerthon.Team3_Backend.domain.emotion.exception;
+
+import com.cokerthon.Team3_Backend.global.apiPayload.code.BaseErrorCode;
+import com.cokerthon.Team3_Backend.global.exception.GeneralException;
+
+public class EmotionException extends GeneralException {
+    public EmotionException(BaseErrorCode code) {
+        super(code);
+    }
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionErrorCode.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionErrorCode.java
new file mode 100644
index 0000000..c1275ea
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionErrorCode.java
@@ -0,0 +1,23 @@
+package com.cokerthon.Team3_Backend.domain.emotion.exception.code;
+
+import com.cokerthon.Team3_Backend.global.apiPayload.code.BaseErrorCode;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@AllArgsConstructor
+public enum EmotionErrorCode implements BaseErrorCode {
+
+    INVALID_EMOTION_SCORE(HttpStatus.BAD_REQUEST, "EMOTION_400_1", "감정 점수는 1~5 사이여야 합니다."),
+
+    EMOTION_FORBIDDEN(HttpStatus.FORBIDDEN, "EMOTION_403_1", "작성자만 수정/삭제할 수 있습니다."),
+
+    EMOTION_NOT_FOUND(HttpStatus.NOT_FOUND, "EMOTION_404_1", "감정 기록이 존재하지 않습니다."),
+
+    ;
+
+    private final HttpStatus status;
+    private final String code;
+    private final String message;
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionSuccessCode.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionSuccessCode.java
new file mode 100644
index 0000000..9bfd11a
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/exception/code/EmotionSuccessCode.java
@@ -0,0 +1,22 @@
+package com.cokerthon.Team3_Backend.domain.emotion.exception.code;
+
+import com.cokerthon.Team3_Backend.global.apiPayload.code.BaseSuccessCode;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+@AllArgsConstructor
+public enum EmotionSuccessCode implements BaseSuccessCode {
+
+    EMOTION_CREATED(HttpStatus.OK, "EMOTION_200_1", "감정 기록 생성 성공"),
+
+    EMOTION_UPDATED(HttpStatus.OK, "EMOTION_200_2", "감정 기록 수정 성공"),
+
+    EMOTION_DELETED(HttpStatus.OK, "EMOTION_200_3", "감정 기록 삭제 성공"),
+    ;
+
+    private final HttpStatus status;
+    private final String code;
+    private final String message;
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/repository/EmotionRepository.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/repository/EmotionRepository.java
new file mode 100644
index 0000000..bcca1b5
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/repository/EmotionRepository.java
@@ -0,0 +1,8 @@
+package com.cokerthon.Team3_Backend.domain.emotion.repository;
+
+import com.cokerthon.Team3_Backend.domain.emotion.entity.EmotionRecord;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface EmotionRepository extends JpaRepository<EmotionRecord, Long> {
+
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/command/EmotionCommandService.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/command/EmotionCommandService.java
new file mode 100644
index 0000000..1a0f08f
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/command/EmotionCommandService.java
@@ -0,0 +1,103 @@
+package com.cokerthon.Team3_Backend.domain.emotion.service.command;
+
+import com.cokerthon.Team3_Backend.domain.emotion.converter.EmotionConverter;
+import com.cokerthon.Team3_Backend.domain.emotion.dto.request.EmotionRequestDto;
+import com.cokerthon.Team3_Backend.domain.emotion.entity.EmotionRecord;
+import com.cokerthon.Team3_Backend.domain.emotion.exception.EmotionException;
+import com.cokerthon.Team3_Backend.domain.emotion.exception.code.EmotionErrorCode;
+import com.cokerthon.Team3_Backend.domain.emotion.repository.EmotionRepository;
+import com.cokerthon.Team3_Backend.domain.user.entity.User;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional
+public class EmotionCommandService {
+
+    private final EmotionRepository emotionRepository;
+
+    /**
+     * 감정 기록 생성
+     *
+     * @param user 사용자 엔티티
+     * @param requestDto 감정 기록 생성 요청 DTO
+     * @return 생성된 감정 기록 엔티티
+     */
+    public EmotionRecord createEmotion(
+            User user,
+            EmotionRequestDto.EmotionCreateRequestDto requestDto
+    ) {
+        validateScore(requestDto.emotionScore());
+
+        EmotionRecord emotion =
+                EmotionConverter.toEntity(user, requestDto);
+
+        return emotionRepository.save(emotion);
+    }
+
+
+    /**
+     * 감정 기록 수정
+     *
+     * @param emotionId 감정 기록 ID
+     * @param user 사용자 엔티티
+     * @param requestDto 감정 기록 수정 요청 DTO
+     */
+    public void updateEmotion(
+            Long emotionId,
+            User user,
+            EmotionRequestDto.EmotionUpdateRequestDto requestDto
+    ) {
+        EmotionRecord emotion = emotionRepository.findById(emotionId)
+                .orElseThrow(() ->
+                        new EmotionException(EmotionErrorCode.EMOTION_NOT_FOUND)
+                );
+
+        validateOwner(emotion, user);
+        validateScore(requestDto.emotionScore());
+
+        emotion.update(
+                requestDto.emotionScore(),
+                requestDto.content()
+        );
+    }
+
+
+    /**
+     * 감정 기록 삭제
+     *
+     * @param emotionId 감정 기록 ID
+     * @param user 사용자 엔티티
+     */
+    public void deleteEmotion(
+            Long emotionId,
+            User user
+    ) {
+        EmotionRecord emotion = emotionRepository.findById(emotionId)
+                .orElseThrow(() ->
+                        new EmotionException(EmotionErrorCode.EMOTION_NOT_FOUND)
+                );
+
+        validateOwner(emotion, user);
+        emotionRepository.delete(emotion);
+    }
+
+
+    // ===== private ===== //
+
+    /** 감정 점수 유효성 검사 */
+    private void validateScore(int score) {
+        if (score < 1 || score > 5) {
+            throw new EmotionException(EmotionErrorCode.INVALID_EMOTION_SCORE);
+        }
+    }
+
+    /** 작성자 검증 */
+    private void validateOwner(EmotionRecord emotion, User user) {
+        if (!emotion.getUser().getId().equals(user.getId())) {
+            throw new EmotionException(EmotionErrorCode.EMOTION_FORBIDDEN);
+        }
+    }
+}
diff --git a/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/query/EmotionQueryService.java b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/query/EmotionQueryService.java
new file mode 100644
index 0000000..0c12fb4
--- /dev/null
+++ b/src/main/java/com/cokerthon/Team3_Backend/domain/emotion/service/query/EmotionQueryService.java
@@ -0,0 +1,4 @@
+package com.cokerthon.Team3_Backend.domain.emotion.service.query;
+
+public class EmotionQueryService {
+}