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..3d42c5d 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 +1,17 @@
-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..afb39a7 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"
@@ -18,4 +18,16 @@ public Cabinet(CabinetStatus status) {
 	public void id(Long id) {
 		this.cabinetId = id;
 	}
+
+	public boolean isAvailable() {
+		return this.cabinetStatus == CabinetStatus.AVAILABLE;
+	}
+
+	public void lent() {
+		this.cabinetStatus = CabinetStatus.FULL;
+	}
+
+	public void returned() {
+		this.cabinetStatus = CabinetStatus.AVAILABLE;
+	}
 }
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..a70f62a 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"
@@ -23,4 +23,8 @@ public LentHistory(Long cabinetId, Long userId, String lentUserName, LocalDateTi
 		this.createdAt = createdAt;
 		this.expiredAt = expiredAt;
 	}
+
+	public void id(Long lentHistoryId) {
+		this.lentHistoryId = lentHistoryId;
+	}
 }
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..b9799db 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"
@@ -1,4 +1,4 @@
-package com.example.lent;
+package com.example.lent.repository;
 
 import com.example.lent.domain.LentHistory;
 
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 64%
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..e3854b2 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"
@@ -1,4 +1,4 @@
-package com.example.lent;
+package com.example.lent.repository;
 
 import com.example.lent.domain.LentHistory;
 
@@ -13,11 +13,18 @@ public class LentHistoryRepositoryImpl implements LentHistoryRepository {
 
 	@Override
 	public LentHistory save(LentHistory lentHistory) {
-		return null;
+		if (lentHistory.getLentHistoryId() != null) {
+			TABLE.removeIf(e -> e.getLentHistoryId().equals(lentHistory.getLentHistoryId()));
+		} else {
+			lentHistory.id(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 82%
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..3c92487 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"
@@ -1,4 +1,4 @@
-package com.example.lent;
+package com.example.lent.service;
 
 import com.example.lent.dto.LentRequest;
 import com.example.lent.dto.LentResponse;
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..15d4815
--- /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 +1,72 @@
+package com.example.lent.service;
+
+import com.example.lent.domain.Cabinet;
+import com.example.lent.domain.LentHistory;
+import com.example.lent.dto.LentRequest;
+import com.example.lent.dto.LentResponse;
+import com.example.lent.repository.LentHistoryRepository;
+import com.example.lent.testutil.CabinetRepository;
+import com.example.lent.testutil.UserRepository;
+import lombok.RequiredArgsConstructor;
+
+/*서비스는 뭘까요?*/
+@RequiredArgsConstructor
+public class LentServiceImpl implements LentService {
+	private static final int LENT_PERIOD = 31;
+
+	private final LentHistoryRepository lentHistoryRepository;
+	private final CabinetRepository cabinetRepository;
+	private final UserRepository userRepository;
+
+	@Override
+	public LentResponse lent(LentRequest request) {
+		if (isBannedUser(request.getUserId())) {
+			throw new RuntimeException("사용 정지상태인 유저입니다.");
+		}
+		if (isAlreadyLent(request.getCabinetId())) {
+			throw new RuntimeException("이미 사용 중인 사물함입니다.");
+		}
+		if (isAlreadyLentUser(request.getUserId())) {
+			throw new RuntimeException("이미 대여 중인 유저입니다.");
+		}
+
+		Cabinet cabinet = cabinetRepository.findAll().stream()
+				.filter(e -> e.getCabinetId().equals(request.getCabinetId()))
+				.findAny()
+				.orElseThrow(() -> new RuntimeException("존재하지 않는 사물함입니다."));
+		cabinet.lent();
+		LentHistory lentHistory = new LentHistory(
+				request.getCabinetId(),
+				request.getUserId(),
+				userRepository.findById(request.getUserId()).getName(),
+				request.getCreatedAt(),
+				request.getCreatedAt().plusDays(LENT_PERIOD)
+		);
+		lentHistoryRepository.save(lentHistory);
+
+		return new LentResponse(
+				lentHistory.getLentHistoryId(),
+				lentHistory.getCabinetId(),
+				lentHistory.getLentUserName(),
+				lentHistory.getCreatedAt(),
+				lentHistory.getExpiredAt()
+		);
+	}
+
+	private boolean isBannedUser(Long userId) {
+		return userRepository.findById(userId).isBanned();
+	}
+
+	private boolean isAlreadyLent(Long cabinetId) {
+		Cabinet cabinet = cabinetRepository.findAll().stream()
+				.filter(e -> e.getCabinetId().equals(cabinetId))
+				.findAny()
+				.orElse(null);
+		return (cabinet != null && !cabinet.isAvailable());
+	}
+
+	private boolean isAlreadyLentUser(Long userId) {
+		return lentHistoryRepository.findAll().stream()
+				.anyMatch(e -> e.getUserId().equals(userId));
+	}
+}
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/test/java/com/example/lent/LentTest.java" "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/test/java/com/example/lent/LentTest.java"
index 7b0211c..340af7e 100644
--- "a/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/test/java/com/example/lent/LentTest.java"
+++ "b/v1/backend/SPRING_LV_2_\352\260\234\353\205\270\353\213\265_3\352\263\204\354\270\265/src/test/java/com/example/lent/LentTest.java"
@@ -1,11 +1,16 @@
 package com.example.lent;
 
+import com.example.lent.controller.LentController;
 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.repository.LentHistoryRepository;
+import com.example.lent.repository.LentHistoryRepositoryImpl;
+import com.example.lent.service.LentService;
+import com.example.lent.service.LentServiceImpl;
 import com.example.lent.testutil.CabinetRepository;
 import com.example.lent.testutil.UserRepository;
 import org.junit.jupiter.api.BeforeEach;