diff --git a/src/main/java/com/example/techeer_partners_api_session/Service/TaskService.java b/src/main/java/com/example/techeer_partners_api_session/Service/TaskService.java
new file mode 100644
index 0000000..95789ae
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/Service/TaskService.java
@@ -0,0 +1,61 @@
+package com.example.techeer_partners_api_session.Service;
+
+import com.example.techeer_partners_api_session.dto.TaskRequestDto;
+import com.example.techeer_partners_api_session.entity.Task;
+import com.example.techeer_partners_api_session.repository.TaskRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class TaskService {
+
+    private final TaskRepository taskRepository;
+
+    public TaskService(TaskRepository taskRepository){
+        this.taskRepository = taskRepository;
+    }
+
+    public void createTask(TaskRequestDto dto){
+        Task task = new Task(dto.getTitle()); // 할 일 객체 생성
+        taskRepository.save(task); // 객체 저장
+    }
+
+    public List<TaskRequestDto> getAllTasks() { // 전체 할 일 조회
+        List<Task> tasks = taskRepository.findAll();
+        // Task 객체를 TaskRequestDto로 변환하여 반환
+        return tasks.stream()
+                .map(Task::toRequestDto)
+                .toList();
+    }
+
+    public List<TaskRequestDto> getTasksByIsDoneStatus(boolean isDone) { // 할 일 상태 조회
+        List<Task> tasks = taskRepository.findByIsDone(isDone);
+        // Task 객체를 TaskRequestDto로 변환하여 반환
+        return tasks.stream()
+                .map(Task::toRequestDto)
+                .toList();
+    }
+
+    public TaskRequestDto updateTask(Long id, TaskRequestDto dto) {
+        // 1. Task 찾기
+        Task task = taskRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("해당 ID의 할 일이 존재하지 않습니다."));
+
+        // 2. Task 수정
+        if (dto.getTitle() != null) {
+            task.setTitle(dto.getTitle());
+        }
+        task.setIsDone(dto.getIsDone()); // true/false 업데이트
+
+        // 3. 저장 후 반환
+        taskRepository.save(task);
+        return task.toRequestDto();
+    }
+
+    public void deleteTask(Long id) {
+        Task task = taskRepository.findById(id)
+                .orElseThrow(() -> new IllegalArgumentException("해당 ID의 할 일이 존재하지 않습니다."));
+        taskRepository.delete(task);
+    }
+}
diff --git a/src/main/java/com/example/techeer_partners_api_session/TecheerPartnersApiSessionApplication.java b/src/main/java/com/example/techeer_partners_api_session/TecheerPartnersApiSessionApplication.java
index dd01199..98d5d29 100644
--- a/src/main/java/com/example/techeer_partners_api_session/TecheerPartnersApiSessionApplication.java
+++ b/src/main/java/com/example/techeer_partners_api_session/TecheerPartnersApiSessionApplication.java
@@ -10,4 +10,4 @@ public static void main(String[] args) {
 		SpringApplication.run(TecheerPartnersApiSessionApplication.class, args);
 	}
 
-}
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/techeer_partners_api_session/controller/GlobalExceptionHandler.java b/src/main/java/com/example/techeer_partners_api_session/controller/GlobalExceptionHandler.java
new file mode 100644
index 0000000..f6a6c9f
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/controller/GlobalExceptionHandler.java
@@ -0,0 +1,21 @@
+package com.example.techeer_partners_api_session.controller;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@ControllerAdvice
+public class GlobalExceptionHandler {
+
+    // IllegalArgumentException 처리
+    @ExceptionHandler
+    public ResponseEntity<Map<String, String>> handleIllegalArgumentException(IllegalArgumentException ex){
+        Map<String, String> response = new HashMap<>();
+        response.put("error", ex.getMessage()); // 에러 메시지
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(response); // 404 상태 코드
+    }
+}
diff --git a/src/main/java/com/example/techeer_partners_api_session/controller/TaskController.java b/src/main/java/com/example/techeer_partners_api_session/controller/TaskController.java
new file mode 100644
index 0000000..2553799
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/controller/TaskController.java
@@ -0,0 +1,94 @@
+package com.example.techeer_partners_api_session.controller;
+
+import com.example.techeer_partners_api_session.Service.TaskService;
+import com.example.techeer_partners_api_session.dto.TaskRequestDto;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/tasks") // 상위 경로
+public class TaskController {
+    private final TaskService taskService;
+
+    public TaskController(TaskService taskService){
+        this.taskService = taskService;
+    }
+
+    @PostMapping
+    public ResponseEntity<Map<String, String>> createTask (@RequestBody TaskRequestDto dto) {
+        taskService.createTask(dto);
+        Map<String, String> response = new HashMap<>();
+        response.put("message", "할 일이 성공적으로 생성되었습니다.");
+        return ResponseEntity.status(201).body(response);
+    }
+
+    // 1. 전체 할 일 조회
+    @GetMapping
+    public ResponseEntity<Map<String, Object>> getAllTasks() {
+        List<TaskRequestDto> tasks = taskService.getAllTasks();
+
+        // 응답 데이터 구성
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("status", "success");
+        response.put("message", "모든 일이 조회되었습니다.");
+        response.put("data", tasks);
+
+        // 201 상태 코드와 함께 DTO 반환
+        return ResponseEntity.status(201).body(response);
+    }
+
+    // 2. 완료된 할 일 조회
+    @GetMapping("/completed") // 하위 경로
+    public ResponseEntity<Map<String, Object>> getIsDoneTasks() {
+        List<TaskRequestDto> isDoneTasks = taskService.getTasksByIsDoneStatus(true);
+
+        // 응답 데이터 구성
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("status", "success");
+        response.put("message", "완료 된 일이 조회되었습니다.");
+        response.put("data", isDoneTasks);
+
+        // 201 상태 코드와 함께 DTO 반환
+        return ResponseEntity.ok(response);
+    }
+
+    // 3. 미완료된 할 일 조회
+    @GetMapping("/uncompleted") // 하위 경로
+    public ResponseEntity<Map<String, Object>> getNotIsDoneTasks() {
+        List<TaskRequestDto> notIsDoneTasks = taskService.getTasksByIsDoneStatus(false);
+
+        // 응답 데이터 구성
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("status", "success");
+        response.put("message", "미완료 된 일이 조회되었습니다.");
+        response.put("data", notIsDoneTasks);
+
+        // 201 상태 코드와 함께 DTO 반환
+        return ResponseEntity.ok(response);
+    }
+
+    @PatchMapping("/{id}")
+    public ResponseEntity<Map<String, Object>> updateTask(@PathVariable Long id, @RequestBody TaskRequestDto dto) {
+        TaskRequestDto updatedTask = taskService.updateTask(id, dto);
+
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("status", "success");
+        response.put("message", "할 일이 성공적으로 수정되었습니다.");
+        response.put("data", updatedTask);
+
+        return ResponseEntity.ok(response);
+    }
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Map<String, String>> deleteTask(@PathVariable Long id) {
+        taskService.deleteTask(id);
+        Map<String, String> response = new HashMap<>();
+        response.put("message", "할 일이 성공적으로 삭제되었습니다.");
+        return ResponseEntity.ok(response);
+    }
+}
diff --git a/src/main/java/com/example/techeer_partners_api_session/dto/TaskRequestDto.java b/src/main/java/com/example/techeer_partners_api_session/dto/TaskRequestDto.java
new file mode 100644
index 0000000..ce29358
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/dto/TaskRequestDto.java
@@ -0,0 +1,22 @@
+package com.example.techeer_partners_api_session.dto;
+
+
+public class TaskRequestDto {
+
+    private final String title;
+
+    private final boolean isDone;
+
+    public TaskRequestDto(String title, boolean isDone){
+        this.title = title;
+        this.isDone = isDone;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public boolean getIsDone() {
+        return isDone;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/techeer_partners_api_session/entity/Task.java b/src/main/java/com/example/techeer_partners_api_session/entity/Task.java
new file mode 100644
index 0000000..e37c504
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/entity/Task.java
@@ -0,0 +1,35 @@
+package com.example.techeer_partners_api_session.entity;
+
+import com.example.techeer_partners_api_session.dto.TaskRequestDto;
+import jakarta.persistence.*;
+
+@Entity
+public class Task {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private String title;
+
+    private boolean isDone = false;
+
+    public Task() {} // JPA의 엔티티 클래스 접근을 위한 기본 생성자
+
+    public Task(String title){ // 할 일 제목 생성
+        this.title = title;
+    }
+
+    // Task 객체를 TaskRequestDto로 변환
+    public TaskRequestDto toRequestDto() {
+        return new TaskRequestDto(this.title, this.isDone);
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setIsDone(boolean done) {
+        this.isDone = done;
+    }
+}
diff --git a/src/main/java/com/example/techeer_partners_api_session/repository/TaskRepository.java b/src/main/java/com/example/techeer_partners_api_session/repository/TaskRepository.java
new file mode 100644
index 0000000..225f634
--- /dev/null
+++ b/src/main/java/com/example/techeer_partners_api_session/repository/TaskRepository.java
@@ -0,0 +1,12 @@
+package com.example.techeer_partners_api_session.repository;
+
+import com.example.techeer_partners_api_session.entity.Task;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public interface TaskRepository extends JpaRepository<Task, Long> {
+    List<Task> findByIsDone(boolean isDone);
+}