diff --git a/src/main/java/org/sophy/sophy/controller/BooktalkController.java b/src/main/java/org/sophy/sophy/controller/BooktalkController.java
index 9d523b31..31273a0a 100644
--- a/src/main/java/org/sophy/sophy/controller/BooktalkController.java
+++ b/src/main/java/org/sophy/sophy/controller/BooktalkController.java
@@ -39,9 +39,10 @@ public class BooktalkController {
     @ResponseStatus(HttpStatus.OK)
     @Operation(summary = "북토크 상세 조회")
     public ApiResponseDto<BooktalkDetailResponseDto> getBooktalkDetail(
+        @Parameter(hidden = true) @AuthenticationPrincipal User user,
         @Parameter(example = "1") @PathVariable("booktalkId") Long booktalkId) {
         return ApiResponseDto.success(SuccessStatus.GET_BOOKTALK_DETAIL_SUCCESS,
-            booktalkService.getBooktalkDetail(booktalkId));
+            booktalkService.getBooktalkDetail(user.getUsername(), booktalkId));
     }
 
     @GetMapping("/search")
diff --git a/src/main/java/org/sophy/sophy/domain/dto/booktalk/response/BooktalkDetailResponseDto.java b/src/main/java/org/sophy/sophy/domain/dto/booktalk/response/BooktalkDetailResponseDto.java
index 269d9ba1..7f5ff61c 100644
--- a/src/main/java/org/sophy/sophy/domain/dto/booktalk/response/BooktalkDetailResponseDto.java
+++ b/src/main/java/org/sophy/sophy/domain/dto/booktalk/response/BooktalkDetailResponseDto.java
@@ -6,6 +6,7 @@
 import lombok.Getter;
 import org.sophy.sophy.domain.Booktalk;
 import org.sophy.sophy.domain.enumerate.BookCategory;
+import org.sophy.sophy.domain.enumerate.BooktalkStatus;
 import org.sophy.sophy.domain.enumerate.PreliminaryInfo;
 
 @Getter
@@ -16,7 +17,7 @@ public class BooktalkDetailResponseDto {
     private String title;
     private String Author;
     private BookCategory bookCategory;
-    private String book; //TODO 추후 연결
+    private String book;
     private LocalDateTime startDate;
     private LocalDateTime endDate;
     private Integer participant;
@@ -25,8 +26,10 @@ public class BooktalkDetailResponseDto {
     private String description;
     private String PlaceName;
     private String PlaceAddress;
+    private Boolean isApply;
+    private BooktalkStatus booktalkStatus;
 
-    public static BooktalkDetailResponseDto of(Booktalk booktalk) {
+    public static BooktalkDetailResponseDto of(Booktalk booktalk, Boolean isApply) {
         return new BooktalkDetailResponseDto(
             booktalk.getBooktalkImageUrl(),
             booktalk.getTitle(),
@@ -40,7 +43,9 @@ public static BooktalkDetailResponseDto of(Booktalk booktalk) {
             booktalk.getPreliminaryInfo(),
             booktalk.getDescription(),
             booktalk.getPlace().getName(),
-            booktalk.getPlace().getAddress()
+            booktalk.getPlace().getAddress(),
+            isApply,
+            booktalk.getBooktalkStatus()
         );
     }
 }
diff --git a/src/main/java/org/sophy/sophy/exception/ErrorStatus.java b/src/main/java/org/sophy/sophy/exception/ErrorStatus.java
index ca24745f..d849e652 100644
--- a/src/main/java/org/sophy/sophy/exception/ErrorStatus.java
+++ b/src/main/java/org/sophy/sophy/exception/ErrorStatus.java
@@ -31,6 +31,7 @@ public enum ErrorStatus {
      */
 
     FORBIDDEN_USER_EXCEPTION(HttpStatus.FORBIDDEN, "접근 권한이 없습니다."),
+    BOOKTALK_RECRUITING_CLOSED_EXCEPTION(HttpStatus.FORBIDDEN, "모집 마감된 북토크입니다."),
     /**
      * 404 NOT FOUND
      */
diff --git a/src/main/java/org/sophy/sophy/service/BooktalkService.java b/src/main/java/org/sophy/sophy/service/BooktalkService.java
index 276d8b3e..88bfec48 100644
--- a/src/main/java/org/sophy/sophy/service/BooktalkService.java
+++ b/src/main/java/org/sophy/sophy/service/BooktalkService.java
@@ -89,9 +89,12 @@ public BooktalkDeleteResponseDto deleteBooktalk(
     }
 
     // 북토크 상세 조회
-    public BooktalkDetailResponseDto getBooktalkDetail(Long booktalkId) {
+    public BooktalkDetailResponseDto getBooktalkDetail(String email, Long booktalkId) {
+        Member member = memberRepository.getMemberByEmail(email);
         Booktalk booktalk = booktalkRepository.getBooktalkById(booktalkId);
-        return BooktalkDetailResponseDto.of(booktalk);
+        Boolean isApply = member.getUserBookTalkList()
+            .stream().anyMatch(memberBooktalk -> memberBooktalk.getBooktalk().equals(booktalk));
+        return BooktalkDetailResponseDto.of(booktalk, isApply);
     }
 
     // 북토크 참여 신청
@@ -101,6 +104,10 @@ public void postBooktalkParticipation(
         Member member = memberRepository.getMemberByEmail(email); //참가 신청 유저
         Booktalk booktalk = booktalkRepository.getBooktalkById(
             booktalkParticipationRequestDto.getBooktalkId()); //참가하고자 하는 북토크
+        if (!booktalk.getBooktalkStatus().equals(BooktalkStatus.RECRUITING)) {
+            throw new ForbiddenException(ErrorStatus.BOOKTALK_RECRUITING_CLOSED_EXCEPTION,
+                ErrorStatus.BOOKTALK_RECRUITING_CLOSED_EXCEPTION.getMessage());
+        }
         //북토크 현재 인원이 최대인원을 넘지 않았는지 체크하는 메서드
         if (booktalk.getMaximum() <= booktalk.getParticipantNum()) {
             throw new OverMaxParticipationException(ErrorStatus.OVER_MAX_PARTICIPATION_EXCEPTION,
@@ -116,6 +123,9 @@ public void postBooktalkParticipation(
         // 복합키?
         memberBooktalkRepository.save(
             booktalkParticipationRequestDto.toMemberBooktalk(booktalk, member));
+        if (booktalk.getMaximum().equals(booktalk.getParticipantNum())) { //인원이 다 찬 경우 마감
+            booktalk.setBooktalkStatus(BooktalkStatus.RECRUITING_CLOSED);
+        }
     }
 
     // 마감임박 북토크 조회