diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentServiceImpl.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentServiceImpl.java"
deleted file mode 100644
index 4ecff32..0000000
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentServiceImpl.java"
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.example.lent;
-
-import com.example.lent.dto.LentRequest;
-import com.example.lent.dto.LentResponse;
-
-/*서비스는 뭘까요?*/
-public class LentServiceImpl implements LentService {
-	@Override
-	public LentResponse lent(LentRequest request) {
-		return null;
-	}
-}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentController.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/controller/LentController.java"
similarity index 54%
rename from "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentController.java"
rename to "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/controller/LentController.java"
index be46233..7abec81 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentController.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/controller/LentController.java"
@@ -1,14 +1,18 @@
-package com.example.lent;
+package com.example.lent.controller;
 
 import com.example.lent.dto.LentRequest;
 import com.example.lent.dto.LentResponse;
+import com.example.lent.service.LentService;
+import lombok.RequiredArgsConstructor;
 
 /*컨트롤러는 뭘까요?*/
 /*컨트롤러는 왜 인터페이스가 없어도 될까요?*/
+@RequiredArgsConstructor
 public class LentController {
-	private LentService lentService;
+
+	private final LentService lentService;
 
 	public LentResponse lent(LentRequest request) {
-		return null;
+		return lentService.lent(request);
 	}
 }
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/Cabinet.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/Cabinet.java"
index d86aa42..69d62a1 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/Cabinet.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/Cabinet.java"
@@ -1,12 +1,11 @@
 package com.example.lent.domain;
 
-import lombok.AllArgsConstructor;
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
 
 /*Entity가 뭘까요?*/
 @Getter
 public class Cabinet {
+
 	private Long cabinetId;
 	private CabinetStatus cabinetStatus;
 
@@ -18,4 +17,8 @@ public Cabinet(CabinetStatus status) {
 	public void id(Long id) {
 		this.cabinetId = id;
 	}
+
+	public void changeStatus(CabinetStatus status) {
+		this.cabinetStatus = status;
+	}
 }
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/CabinetConfig.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/CabinetConfig.java"
new file mode 100644
index 0000000..59e8d3e
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/CabinetConfig.java"
@@ -0,0 +1,6 @@
+package com.example.lent.domain;
+
+public class CabinetConfig {
+
+	public static final int LENDING_PERIOD = 31;
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/LentHistory.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/LentHistory.java"
index d7f3169..63e84c1 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/LentHistory.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/domain/LentHistory.java"
@@ -1,26 +1,29 @@
 package com.example.lent.domain;
 
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-
 import java.time.LocalDateTime;
+import lombok.Getter;
 
 /*Entity가 뭘까요?*/
 @Getter
 public class LentHistory {
+
+	private final Long userId;
+	private final Long cabinetId;
+	private final String lentUserName;
+	private final LocalDateTime createdAt;
+	private final LocalDateTime expiredAt;
 	private Long lentHistoryId;
-	private Long userId;
-	private Long cabinetId;
-	private String lentUserName;
-	private LocalDateTime createdAt;
-	private LocalDateTime expiredAt;
 
-	public LentHistory(Long cabinetId, Long userId, String lentUserName, LocalDateTime createdAt, LocalDateTime expiredAt) {
+	public LentHistory(Long cabinetId, Long userId, String lentUserName, LocalDateTime createdAt,
+			LocalDateTime expiredAt) {
 		this.cabinetId = cabinetId;
 		this.userId = userId;
 		this.lentUserName = lentUserName;
 		this.createdAt = createdAt;
 		this.expiredAt = expiredAt;
 	}
+
+	public void setId(Long id) {
+		this.lentHistoryId = id;
+	}
 }
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetAlreadyLentException.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetAlreadyLentException.java"
new file mode 100644
index 0000000..7f11032
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetAlreadyLentException.java"
@@ -0,0 +1,10 @@
+package com.example.lent.exception;
+
+import static com.example.lent.exception.ExceptionMessages.CABINET_ALREADY_LENT;
+
+public class CabinetAlreadyLentException extends RuntimeException {
+
+	public CabinetAlreadyLentException() {
+		super(CABINET_ALREADY_LENT.getMessage());
+	}
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetNotExistException.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetNotExistException.java"
new file mode 100644
index 0000000..b4583ce
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/CabinetNotExistException.java"
@@ -0,0 +1,10 @@
+package com.example.lent.exception;
+
+import static com.example.lent.exception.ExceptionMessages.CABINET_NOT_EXIST;
+
+public class CabinetNotExistException extends RuntimeException {
+
+	public CabinetNotExistException() {
+		super(CABINET_NOT_EXIST.getMessage());
+	}
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/ExceptionMessages.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/ExceptionMessages.java"
new file mode 100644
index 0000000..58d02d2
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/ExceptionMessages.java"
@@ -0,0 +1,18 @@
+package com.example.lent.exception;
+
+public enum ExceptionMessages {
+	CABINET_ALREADY_LENT("이미 사용 중인 사물함입니다."),
+	USER_ALREADY_LENT("이미 대여 중인 유저입니다."),
+	USER_BANNED("사용 정지상태인 유저입니다."),
+	CABINET_NOT_EXIST("해당 사물함을 찾을 수 없습니다.");
+
+	private final String message;
+
+	ExceptionMessages(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserAlreadyLentException.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserAlreadyLentException.java"
new file mode 100644
index 0000000..86693c5
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserAlreadyLentException.java"
@@ -0,0 +1,10 @@
+package com.example.lent.exception;
+
+import static com.example.lent.exception.ExceptionMessages.USER_ALREADY_LENT;
+
+public class UserAlreadyLentException extends RuntimeException {
+
+	public UserAlreadyLentException() {
+		super(USER_ALREADY_LENT.getMessage());
+	}
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserBannedException.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserBannedException.java"
new file mode 100644
index 0000000..d651591
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/exception/UserBannedException.java"
@@ -0,0 +1,10 @@
+package com.example.lent.exception;
+
+import static com.example.lent.exception.ExceptionMessages.USER_BANNED;
+
+public class UserBannedException extends RuntimeException {
+
+	public UserBannedException() {
+		super(USER_BANNED.getMessage());
+	}
+}
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepository.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepository.java"
similarity index 83%
rename from "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepository.java"
rename to "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepository.java"
index 534a121..7208fcf 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepository.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepository.java"
@@ -1,10 +1,10 @@
-package com.example.lent;
+package com.example.lent.repository;
 
 import com.example.lent.domain.LentHistory;
-
 import java.util.List;
 
 public interface LentHistoryRepository {
+
 	LentHistory save(LentHistory lentHistory);
 
 	List<LentHistory> findAll();
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepositoryImpl.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepositoryImpl.java"
similarity index 73%
rename from "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepositoryImpl.java"
rename to "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepositoryImpl.java"
index 96cff00..daf90a8 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentHistoryRepositoryImpl.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/repository/LentHistoryRepositoryImpl.java"
@@ -1,23 +1,25 @@
-package com.example.lent;
+package com.example.lent.repository;
 
 import com.example.lent.domain.LentHistory;
-
 import java.util.ArrayList;
 import java.util.List;
 
 /*리포지토리는 뭘까요?*/
 public class LentHistoryRepositoryImpl implements LentHistoryRepository {
-	private static Long ID_SEQUENCE = 1L;
+
 	/*실제 DB를 사용하지 않으므로 내부 Collection으로 대체합니다. - Collection이 뭘까요?*/
 	private static final List<LentHistory> TABLE = new ArrayList<>();
+	private Long ID_SEQUENCE = 1L;
 
 	@Override
 	public LentHistory save(LentHistory lentHistory) {
-		return null;
+		lentHistory.setId(ID_SEQUENCE++);
+		TABLE.add(lentHistory);
+		return lentHistory;
 	}
 
 	@Override
 	public List<LentHistory> findAll() {
-		return null;
+		return List.copyOf(TABLE);
 	}
 }
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentService.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentService.java"
similarity index 81%
rename from "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentService.java"
rename to "v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentService.java"
index 1892b70..fea3af2 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/LentService.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentService.java"
@@ -1,8 +1,9 @@
-package com.example.lent;
+package com.example.lent.service;
 
 import com.example.lent.dto.LentRequest;
 import com.example.lent.dto.LentResponse;
 
 public interface LentService {
+
 	LentResponse lent(LentRequest request);
 }
diff --git "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentServiceImpl.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentServiceImpl.java"
new file mode 100644
index 0000000..918e349
--- /dev/null
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/main/java/com/example/lent/service/LentServiceImpl.java"
@@ -0,0 +1,84 @@
+package com.example.lent.service;
+
+import static com.example.lent.domain.CabinetConfig.LENDING_PERIOD;
+
+import com.example.lent.domain.Cabinet;
+import com.example.lent.domain.CabinetStatus;
+import com.example.lent.domain.LentHistory;
+import com.example.lent.domain.User;
+import com.example.lent.dto.LentRequest;
+import com.example.lent.dto.LentResponse;
+import com.example.lent.exception.CabinetAlreadyLentException;
+import com.example.lent.exception.CabinetNotExistException;
+import com.example.lent.exception.UserAlreadyLentException;
+import com.example.lent.exception.UserBannedException;
+import com.example.lent.repository.LentHistoryRepository;
+import com.example.lent.testutil.CabinetRepository;
+import com.example.lent.testutil.UserRepository;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+
+/*서비스는 뭘까요?*/
+@RequiredArgsConstructor
+public class LentServiceImpl implements LentService {
+
+	private final LentHistoryRepository lentHistoryRepository;
+	private final CabinetRepository cabinetRepository;
+	private final UserRepository userRepository;
+
+	private static void checkCabinetAvailabilityAndUserStatus(Cabinet findCabinet,
+			List<LentHistory> lentHistoryList,
+			User findUser) {
+		// 사물함의 상태가 사용중인 경우
+		if (findCabinet.getCabinetStatus() == CabinetStatus.FULL) {
+			throw new CabinetAlreadyLentException();
+		}
+
+		// 유저가 현재 사물함을 대여중인 경우
+		if (isUserLent(lentHistoryList, findUser)) {
+			throw new UserAlreadyLentException();
+		}
+
+		// 사용 정지 상태인 유저인 경우
+		if (findUser.isBanned()) {
+			throw new UserBannedException();
+		}
+	}
+
+	private static boolean isUserLent(List<LentHistory> lentHistoryList, User findUser) {
+		return lentHistoryList.stream()
+				.findFirst()
+				.filter(lentHistory -> lentHistory.getLentUserName() == findUser.getName())
+				.isPresent();
+	}
+
+	@Override
+	public LentResponse lent(LentRequest request) {
+		Cabinet findCabinet = cabinetRepository.findAll()
+				.stream()
+				.filter(cabinet -> cabinet.getCabinetId() == request.getCabinetId())
+				.findFirst()
+				.orElseThrow(() -> new CabinetNotExistException());
+
+		User findUser = userRepository.findById(request.getUserId());
+		List<LentHistory> lentHistoryList = lentHistoryRepository.findAll();
+
+		checkCabinetAvailabilityAndUserStatus(findCabinet, lentHistoryList, findUser);
+
+		findCabinet.changeStatus(CabinetStatus.FULL);
+		cabinetRepository.save(findCabinet);
+
+		LentHistory lentHistory = lentHistoryRepository.save(new LentHistory(
+				findCabinet.getCabinetId(),
+				findUser.getUserId(),
+				findUser.getName(),
+				request.getCreatedAt(),
+				request.getCreatedAt().plusDays(LENDING_PERIOD)));
+
+		return new LentResponse(lentHistory.getLentHistoryId(),
+				lentHistory.getCabinetId(),
+				findUser.getName(),
+				lentHistory.getCreatedAt(),
+				lentHistory.getExpiredAt());
+	}
+}