diff --git a/src/main/java/com/keepgoing/keepserver/domain/book/domain/entity/Book.java b/src/main/java/com/keepgoing/keepserver/domain/book/domain/entity/Book.java
index 6f4a8fb..f3a1ea0 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/book/domain/entity/Book.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/book/domain/entity/Book.java
@@ -58,11 +58,17 @@ public class Book {
     private String imageUrl;
 
     /*
-        기기 대여 시작일
+        책 대여 시작일
     */
     @Column
     private LocalDateTime rentDate;
 
+    /*
+        책 마지막 대여자 mail
+     */
+    @Column
+    private String lastBorrowerMail;
+
     /*
         책 대여자
     */
diff --git a/src/main/java/com/keepgoing/keepserver/domain/book/mapper/BookMapper.java b/src/main/java/com/keepgoing/keepserver/domain/book/mapper/BookMapper.java
index f2a16c8..29fe5e3 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/book/mapper/BookMapper.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/book/mapper/BookMapper.java
@@ -17,6 +17,7 @@ public BookResponseDto entityToDto(Book entity) {
                 .writer(entity.getWriter())
                 .imageUrl(entity.getImageUrl())
                 .nfcCode(entity.getNfcCode())
+                .lastBorrowerMail(entity.getLastBorrowerMail())
                 .rentDate(entity.getRentDate())
                 .state(entity.getState())
                 .build();
diff --git a/src/main/java/com/keepgoing/keepserver/domain/book/payload/response/BookResponseDto.java b/src/main/java/com/keepgoing/keepserver/domain/book/payload/response/BookResponseDto.java
index 6e5f563..492cf57 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/book/payload/response/BookResponseDto.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/book/payload/response/BookResponseDto.java
@@ -13,6 +13,7 @@ public record BookResponseDto(
         String writer,
         String imageUrl,
         String nfcCode,
+        String lastBorrowerMail,
         LocalDateTime registrationDate,
         LocalDateTime rentDate,
         BookState state
diff --git a/src/main/java/com/keepgoing/keepserver/domain/device/domain/entity/Device.java b/src/main/java/com/keepgoing/keepserver/domain/device/domain/entity/Device.java
index 7f6f1fe..c131f02 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/device/domain/entity/Device.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/device/domain/entity/Device.java
@@ -51,6 +51,12 @@ public class Device {
     @Column
     private LocalDateTime rentDate;
 
+    /*
+        기기 마지막 대여자 mail
+     */
+    @Column
+    private String lastBorrowerMail;
+
     /*
         대여자 id
     */
diff --git a/src/main/java/com/keepgoing/keepserver/domain/device/mapper/DeviceMapper.java b/src/main/java/com/keepgoing/keepserver/domain/device/mapper/DeviceMapper.java
index 8092b4d..1c6a4df 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/device/mapper/DeviceMapper.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/device/mapper/DeviceMapper.java
@@ -18,6 +18,7 @@ public DeviceResponseDto entityToDto(Device entity) {
                 .deviceName(entity.getDeviceName())
                 .imgUrl(entity.getImgUrl())
                 .borrower(entity.getBorrower() != null ? entity.getBorrower().getName() : "대여자 없음")
+                .lastBorrowerMail(entity.getLastBorrowerMail())
                 .regDate(entity.getRegDate())
                 .rentDate(entity.getRentDate())
                 .status(entity.getStatus())
diff --git a/src/main/java/com/keepgoing/keepserver/domain/device/payload/response/DeviceResponseDto.java b/src/main/java/com/keepgoing/keepserver/domain/device/payload/response/DeviceResponseDto.java
index c96b6a4..f11a6c1 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/device/payload/response/DeviceResponseDto.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/device/payload/response/DeviceResponseDto.java
@@ -12,6 +12,7 @@ public record DeviceResponseDto(
         String deviceName,
         String imgUrl,
         String borrower,
+        String lastBorrowerMail,
         LocalDateTime regDate,
         LocalDateTime rentDate,
         DeviceStatus status
diff --git a/src/main/java/com/keepgoing/keepserver/domain/returns/service/ReturnServiceImpl.java b/src/main/java/com/keepgoing/keepserver/domain/returns/service/ReturnServiceImpl.java
index 5996864..68e1bb8 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/returns/service/ReturnServiceImpl.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/returns/service/ReturnServiceImpl.java
@@ -33,7 +33,7 @@ public BaseResponse returnDevice(String deviceName, String email) {
         User user = deviceService.findUserByEmail(email);
         Device device = findDeviceByName(deviceName);
         validateDeviceBorrower(device, user);
-        returnDeviceFromUser(device);
+        returnDeviceFromUser(device, user);
         return new BaseResponse(HttpStatus.OK, "반납이 완료 되었습니다.", deviceMapper.entityToDto(device));
     }
 
@@ -42,7 +42,7 @@ public BaseResponse returnBook(String nfcCode, String email) {
         User user = deviceService.findUserByEmail(email);
         Book book = findBookByNfcCodeContaining(nfcCode);
         validateBookBorrower(book, user);
-        returnBookFromUser(book);
+        returnBookFromUser(book, user);
         return new BaseResponse(HttpStatus.OK, "반납이 완료 되었습니다.", bookMapper.entityToDto(book));
     }
 
@@ -57,7 +57,8 @@ private void validateDeviceBorrower(Device device, User user) {
         }
     }
 
-    private void returnDeviceFromUser(Device device) {
+    private void returnDeviceFromUser(Device device, User user) {
+        device.setLastBorrowerMail(user.getEmail());
         device.setBorrower(null);
         device.setStatus(DeviceStatus.AVAILABLE);
         device.setRentDate(null);
@@ -75,7 +76,8 @@ private void validateBookBorrower(Book book, User user) {
         }
     }
 
-    private void returnBookFromUser(Book book) {
+    private void returnBookFromUser(Book book, User user) {
+        book.setLastBorrowerMail(user.getEmail());
         book.setBorrower(null);
         book.setState(BookState.AVAILABLE);
         book.setRentDate(null);
diff --git a/src/main/java/com/keepgoing/keepserver/domain/user/domain/repository/user/UserQueryRepositoryImpl.java b/src/main/java/com/keepgoing/keepserver/domain/user/domain/repository/user/UserQueryRepositoryImpl.java
index 56eac2b..4bead74 100644
--- a/src/main/java/com/keepgoing/keepserver/domain/user/domain/repository/user/UserQueryRepositoryImpl.java
+++ b/src/main/java/com/keepgoing/keepserver/domain/user/domain/repository/user/UserQueryRepositoryImpl.java
@@ -47,6 +47,7 @@ public UserDto getProfileById(long id) {
                                                 device.deviceName,
                                                 device.imgUrl,
                                                 device.borrower.name,
+                                                device.lastBorrowerMail,
                                                 device.regDate,
                                                 device.rentDate,
                                                 device.status
@@ -59,6 +60,7 @@ public UserDto getProfileById(long id) {
                                                 book.writer,
                                                 book.imageUrl,
                                                 book.nfcCode,
+                                                book.lastBorrowerMail,
                                                 book.registrationDate,
                                                 book.rentDate,
                                                 book.state
@@ -80,6 +82,7 @@ public UserDto getProfileById(long id) {
                                           .collect(Collectors.toSet()))
                       .borrowedBooks(dto.borrowedBooks().stream().filter(r -> r.id() != 0).collect(Collectors.toSet()))
                       .build();
+//        return null;
     }
 
     @Override