diff --git a/majorLink/src/main/java/com/example/majorLink/controller/LectureController.java b/majorLink/src/main/java/com/example/majorLink/controller/LectureController.java
index 1238038..d469f41 100644
--- a/majorLink/src/main/java/com/example/majorLink/controller/LectureController.java
+++ b/majorLink/src/main/java/com/example/majorLink/controller/LectureController.java
@@ -68,13 +68,17 @@ public void deleteLecture(@PathVariable(name = "lectureId") Long lectureId,
     @GetMapping("/list")
     @ResponseBody
     // 스웨거 세팅 후 파라미터 등 설명 추가
-    public LectureResponseDTO.LecturePreViewList getLectures(@RequestParam(name = "page") Integer page){
+    public LectureResponseDTO.LecturePreViewList getLectures(@RequestParam(name = "page", defaultValue = "1") Integer page){
         Page<Lecture> lectureList = lectureService.getLectureList(page-1);
 
         return LectureResponseDTO.LecturePreViewList.builder()
                 .lectureList(lectureList.stream()
                         .map(lecture -> LectureResponseDTO.LecturePreView.builder()
                                 .name(lecture.getName())
+                                .cNum(lecture.getCNum())
+                                .pNum(lecture.getPNum())
+                                .mainCategory(lecture.getCategory().getMainCategory())
+                                .subCategory(lecture.getCategory().getSubCategory())
                                 .build())
                         .collect(Collectors.toList()))
                 .listSize(lectureList.getNumberOfElements())
@@ -85,6 +89,31 @@ public LectureResponseDTO.LecturePreViewList getLectures(@RequestParam(name = "p
                 .build();
     }
 
+    // 강의 상세페이지
+    @GetMapping("/{lectureId}/details")
+    @ResponseBody
+    public LectureResponseDTO.LectureDetails getLecture(@PathVariable(name = "lectureId") Long lectureId){
+        Lecture lecture = lectureService.getLecture(lectureId);
+
+        return LectureResponseDTO.LectureDetails.builder()
+                .name(lecture.getName())
+                .body(lecture.getBody())
+                .curri(lecture.getCurri())
+                .info(lecture.getInfo())
+                .level(lecture.getLevel().name())
+                .cNum(lecture.getCNum())
+                .pNum(lecture.getPNum())
+                .time(lecture.getTime().toString())
+                .day(lecture.getDay().name())
+                .startDate(lecture.getStartDate())
+                .exam(lecture.getExam().name())
+                .tag(lecture.getTag())
+                .tutor(lecture.getTutor())
+                .mainCategory(lecture.getCategory().getMainCategory())
+                .subCategory(lecture.getCategory().getSubCategory())
+                .build();
+    }
+
     // 강의 수강 신청 api
     @PostMapping("/{lectureId}/register")
     @ResponseBody
@@ -100,16 +129,6 @@ public LectureResponseDTO.CreateTuteeLecture createTuteeLecture(@PathVariable(na
                 .build();
     }
 
-    // 강의 취소 api
-    @DeleteMapping("/{lectureId}/cancel")
-    @ResponseBody
-    public void cancelLecture(@PathVariable(name = "lectureId") Long lectureId,
-                              @AuthenticationPrincipal AuthUser authUser){
-        User user = authUser.getUser();
-
-        lectureService.cancelLecture(user.getId(), lectureId);
-    }
-
     // 강의 좋아요 토글 api
     @PostMapping("/{lectureId}/like")
     @ResponseBody
@@ -123,13 +142,17 @@ public Boolean toggleLike(@PathVariable(name = "lectureId") Long lectureId,
     // 좋아요 많은 강의 조회 api
     @GetMapping("/mostLiked")
     @ResponseBody
-    public LectureResponseDTO.LecturePreViewList getMostLikedLectures(@RequestParam(name = "page") Integer page){
+    public LectureResponseDTO.LecturePreViewList getMostLikedLectures(@RequestParam(name = "page", defaultValue = "1") Integer page){
         Page<Lecture> lectureList = lectureService.getMostLikedLecture(page-1);
 
         return LectureResponseDTO.LecturePreViewList.builder()
                 .lectureList(lectureList.stream()
                         .map(lecture -> LectureResponseDTO.LecturePreView.builder()
                                 .name(lecture.getName())
+                                .mainCategory(lecture.getCategory().getMainCategory())
+                                .subCategory(lecture.getCategory().getSubCategory())
+                                .cNum(lecture.getCNum())
+                                .pNum(lecture.getPNum())
                                 .build())
                         .collect(Collectors.toList()))
                 .listSize(lectureList.getNumberOfElements())
@@ -143,13 +166,17 @@ public LectureResponseDTO.LecturePreViewList getMostLikedLectures(@RequestParam(
     // 최신 강의 조회 api
     @GetMapping("/new")
     @ResponseBody
-    public LectureResponseDTO.LecturePreViewList getNewLectures(@RequestParam(name = "page") Integer page){
+    public LectureResponseDTO.LecturePreViewList getNewLectures(@RequestParam(name = "page", defaultValue = "1") Integer page){
         Page<Lecture> lectureList = lectureService.getNewLecture(page-1);
 
         return LectureResponseDTO.LecturePreViewList.builder()
                 .lectureList(lectureList.stream()
                         .map(lecture -> LectureResponseDTO.LecturePreView.builder()
                                 .name(lecture.getName())
+                                .mainCategory(lecture.getCategory().getMainCategory())
+                                .subCategory(lecture.getCategory().getSubCategory())
+                                .cNum(lecture.getCNum())
+                                .pNum(lecture.getPNum())
                                 .build())
                         .collect(Collectors.toList()))
                 .listSize(lectureList.getNumberOfElements())
@@ -163,13 +190,17 @@ public LectureResponseDTO.LecturePreViewList getNewLectures(@RequestParam(name =
     // 가장 많이 모집된 강의 조회 api
     @GetMapping("/mostRecruited")
     @ResponseBody
-    public LectureResponseDTO.LecturePreViewList getMostRecruitedLectures(@RequestParam(name = "page") Integer page){
+    public LectureResponseDTO.LecturePreViewList getMostRecruitedLectures(@RequestParam(name = "page", defaultValue = "1") Integer page){
         Page<Lecture> lectureList = lectureService.getMostRecruitedLecture(page-1);
 
         return LectureResponseDTO.LecturePreViewList.builder()
                 .lectureList(lectureList.stream()
                         .map(lecture -> LectureResponseDTO.LecturePreView.builder()
                                 .name(lecture.getName())
+                                .mainCategory(lecture.getCategory().getMainCategory())
+                                .subCategory(lecture.getCategory().getSubCategory())
+                                .cNum(lecture.getCNum())
+                                .pNum(lecture.getPNum())
                                 .build())
                         .collect(Collectors.toList()))
                 .listSize(lectureList.getNumberOfElements())
@@ -183,7 +214,7 @@ public LectureResponseDTO.LecturePreViewList getMostRecruitedLectures(@RequestPa
     // 카테고리별 강의 조회 api
     @GetMapping("/{categoryId}")
     @ResponseBody
-    public LectureResponseDTO.LecturePreViewList getLecturesByCategory(@RequestParam(name = "page") Integer page,
+    public LectureResponseDTO.LecturePreViewList getLecturesByCategory(@RequestParam(name = "page", defaultValue = "1") Integer page,
                                                                        @PathVariable(name = "categoryId") Long categoryId){
         Page<Lecture> lectureList = lectureService.getLectureByCategory(page-1, categoryId);
 
@@ -191,6 +222,10 @@ public LectureResponseDTO.LecturePreViewList getLecturesByCategory(@RequestParam
                 .lectureList(lectureList.stream()
                         .map(lecture -> LectureResponseDTO.LecturePreView.builder()
                                 .name(lecture.getName())
+                                .mainCategory(lecture.getCategory().getMainCategory())
+                                .subCategory(lecture.getCategory().getSubCategory())
+                                .cNum(lecture.getCNum())
+                                .pNum(lecture.getPNum())
                                 .build())
                         .collect(Collectors.toList()))
                 .listSize(lectureList.getNumberOfElements())
@@ -200,4 +235,30 @@ public LectureResponseDTO.LecturePreViewList getLecturesByCategory(@RequestParam
                 .isLast(lectureList.isLast())
                 .build();
     }
+
+    // 메인 카테고리 조회 api
+    @GetMapping("/categories/main")
+    @ResponseBody
+    public LectureResponseDTO.MainCategory getMainCategory() {
+        return LectureResponseDTO.MainCategory.builder()
+                .mainCategoryList(lectureService.getMainCategory())
+                .build();
+    }
+
+    // 서브 카테고리 조회 api
+    @GetMapping("/categories/sub")
+    @ResponseBody
+    public LectureResponseDTO.SubCategory getSubCategory(@RequestParam(name = "mainCategory") String mainCategory) {
+        return LectureResponseDTO.SubCategory.builder()
+                .subCategoryList(lectureService.getSubCategory(mainCategory))
+                .build();
+    }
+
+    // 카테고리 id 조회 api
+    @GetMapping("/categories/id")
+    @ResponseBody
+    public Long getCategoryId(@RequestParam(name = "mainCategory") String mainCategory,
+                              @RequestParam(name = "subCategory") String subCategory) {
+        return lectureService.getCategoryId(mainCategory, subCategory);
+    }
 }
diff --git a/majorLink/src/main/java/com/example/majorLink/controller/ReviewController.java b/majorLink/src/main/java/com/example/majorLink/controller/ReviewController.java
index f9d2995..b4b2a7b 100644
--- a/majorLink/src/main/java/com/example/majorLink/controller/ReviewController.java
+++ b/majorLink/src/main/java/com/example/majorLink/controller/ReviewController.java
@@ -72,6 +72,8 @@ public ReviewResponseDTO.ReviewPreViewList getReviews(@PathVariable(name = "lect
                 .reviewList(reviewList.stream()
                         .map(review -> ReviewResponseDTO.ReviewPreView.builder()
                                 .ownerNickname(review.getUser().getUsername())
+                                .createdAt(review.getCreatedAt())
+                                .title(review.getTitle())
                                 .rate(review.getRate())
                                 .build())
                         .collect(Collectors.toList()))
@@ -86,11 +88,12 @@ public ReviewResponseDTO.ReviewPreViewList getReviews(@PathVariable(name = "lect
     // 리뷰 내용 조회 api
     @GetMapping("/{reviewId}/details")
     @ResponseBody
-    public ReviewResponseDTO.ReviewPreView getReview(@PathVariable(name = "reviewId") Long reviewId){
+    public ReviewResponseDTO.ReviewDetails getReview(@PathVariable(name = "reviewId") Long reviewId){
         Review review = reviewService.getReview(reviewId);
 
-        return ReviewResponseDTO.ReviewPreView.builder()
+        return ReviewResponseDTO.ReviewDetails.builder()
                 .ownerNickname(review.getUser().getUsername())
+                .title(review.getTitle())
                 .rate(review.getRate())
                 .content(review.getContent())
                 .createdAt(review.getCreatedAt())
diff --git a/majorLink/src/main/java/com/example/majorLink/domain/Lecture.java b/majorLink/src/main/java/com/example/majorLink/domain/Lecture.java
index 28b9286..ec0d14d 100644
--- a/majorLink/src/main/java/com/example/majorLink/domain/Lecture.java
+++ b/majorLink/src/main/java/com/example/majorLink/domain/Lecture.java
@@ -27,7 +27,7 @@ public class Lecture extends BaseEntity{
     private String body;
 
     @Column(nullable = false)
-    private int curri;
+    private Integer curri;
 
     @Column(nullable = false, length = 1000)
     private String info;
@@ -38,11 +38,11 @@ public class Lecture extends BaseEntity{
 
     // 총 인원
     @Column(nullable = false)
-    private int pNum;
+    private Integer pNum;
 
     // 현재 신청 인원
     @Column(nullable = false)
-    private int curPNum;
+    private Integer cNum;
 
     private LocalTime time;
 
@@ -57,7 +57,7 @@ public class Lecture extends BaseEntity{
     @Column(nullable = false, columnDefinition = "VARCHAR(10)")
     private Exam exam;
 
-    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
+    @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "category_id")
     private Category category;
 
@@ -83,10 +83,10 @@ public void updateLecture(String name, String body, int curri, String info, Leve
     }
 
     public void addCurPNum(){
-        this.curPNum++;
+        this.cNum++;
     }
 
     public void subCurPNum(){
-        this.curPNum--;
+        this.cNum--;
     }
 }
\ No newline at end of file
diff --git a/majorLink/src/main/java/com/example/majorLink/dto/request/LectureRequestDTO.java b/majorLink/src/main/java/com/example/majorLink/dto/request/LectureRequestDTO.java
index 52d4385..d9078a3 100644
--- a/majorLink/src/main/java/com/example/majorLink/dto/request/LectureRequestDTO.java
+++ b/majorLink/src/main/java/com/example/majorLink/dto/request/LectureRequestDTO.java
@@ -3,24 +3,30 @@
 import com.example.majorLink.domain.enums.Day;
 import com.example.majorLink.domain.enums.Exam;
 import com.example.majorLink.domain.enums.Level;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 import java.time.LocalTime;
 import java.util.Date;
 
 @Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
 public class LectureRequestDTO {
     // 새로운 강의 등록할때 필요한 정보들 작성
     String name;
     String body; // 강의 개요
-    int curri; // 강의 횟수
+    Integer curri; // 강의 횟수
     String info; // 강의 정보
     Level level;
-    int pNum;
     LocalTime time;
     Day day; // 요일
     Date startDate;
     Exam exam; // 시험 유무
     Long categoryId;
     String tag;
+    Integer num; // 정원
 }
diff --git a/majorLink/src/main/java/com/example/majorLink/dto/response/LectureResponseDTO.java b/majorLink/src/main/java/com/example/majorLink/dto/response/LectureResponseDTO.java
index a74dccc..ed6109d 100644
--- a/majorLink/src/main/java/com/example/majorLink/dto/response/LectureResponseDTO.java
+++ b/majorLink/src/main/java/com/example/majorLink/dto/response/LectureResponseDTO.java
@@ -6,6 +6,7 @@
 import lombok.NoArgsConstructor;
 
 import java.time.LocalDateTime;
+import java.util.Date;
 import java.util.List;
 
 public class LectureResponseDTO {
@@ -24,6 +25,32 @@ public static class CreateLecture {
     @NoArgsConstructor
     public static class LecturePreView {
         String name;
+        Integer cNum;
+        Integer pNum;
+        String mainCategory;
+        String subCategory;
+    }
+
+    @Builder
+    @Getter
+    @AllArgsConstructor
+    @NoArgsConstructor
+    public static class LectureDetails {
+        String name;
+        String body;
+        Integer curri;
+        String info;
+        String level;
+        Integer cNum;
+        Integer pNum;
+        String time;
+        String day;
+        Date startDate;
+        String exam;
+        String tag;
+        String tutor;
+        String mainCategory;
+        String subCategory;
     }
 
     @Builder
@@ -56,4 +83,20 @@ public static class CreateTuteeLecture {
         Long tuteeLectureId;
         LocalDateTime createdAt;
     }
+
+    @Builder
+    @Getter
+    @AllArgsConstructor
+    @NoArgsConstructor
+    public static class MainCategory {
+        List<String> mainCategoryList;
+    }
+
+    @Builder
+    @Getter
+    @AllArgsConstructor
+    @NoArgsConstructor
+    public static class SubCategory {
+        List<String> subCategoryList;
+    }
 }
diff --git a/majorLink/src/main/java/com/example/majorLink/dto/response/ReviewResponseDTO.java b/majorLink/src/main/java/com/example/majorLink/dto/response/ReviewResponseDTO.java
index 7818397..9940175 100644
--- a/majorLink/src/main/java/com/example/majorLink/dto/response/ReviewResponseDTO.java
+++ b/majorLink/src/main/java/com/example/majorLink/dto/response/ReviewResponseDTO.java
@@ -26,6 +26,18 @@ public static class CreateReview {
     public static class ReviewPreView {
         String ownerNickname;
         int rate;
+        String title;
+        LocalDateTime createdAt;
+    }
+
+    @Builder
+    @Getter
+    @AllArgsConstructor
+    @NoArgsConstructor
+    public static class ReviewDetails {
+        String ownerNickname;
+        int rate;
+        String title;
         String content;
         LocalDateTime createdAt;
     }
diff --git a/majorLink/src/main/java/com/example/majorLink/repository/CategoryRepository.java b/majorLink/src/main/java/com/example/majorLink/repository/CategoryRepository.java
index b4cf253..9a5bb21 100644
--- a/majorLink/src/main/java/com/example/majorLink/repository/CategoryRepository.java
+++ b/majorLink/src/main/java/com/example/majorLink/repository/CategoryRepository.java
@@ -2,9 +2,19 @@
 
 import com.example.majorLink.domain.Category;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+import java.util.Optional;
+
 @Repository
 public interface CategoryRepository extends JpaRepository<Category, Long> {
-    // 필요한 추가 쿼리 메소드가 있다면 여기에 정의
+    @Query("SELECT DISTINCT c.mainCategory FROM Category c")
+    List<String> findMainCategory();
+
+    @Query("SELECT c.subCategory FROM Category c WHERE c.mainCategory = :mainCategory")
+    List<String> findSubCategory(String mainCategory);
+
+    Optional<Category> findByMainCategoryAndSubCategory(String mainCategory, String subCategory);
 }
diff --git a/majorLink/src/main/java/com/example/majorLink/repository/LectureRepository.java b/majorLink/src/main/java/com/example/majorLink/repository/LectureRepository.java
index 8a54c65..6107002 100644
--- a/majorLink/src/main/java/com/example/majorLink/repository/LectureRepository.java
+++ b/majorLink/src/main/java/com/example/majorLink/repository/LectureRepository.java
@@ -1,7 +1,6 @@
 package com.example.majorLink.repository;
 
 import com.example.majorLink.domain.Lecture;
-import com.example.majorLink.domain.User;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
@@ -11,7 +10,7 @@ public interface LectureRepository extends JpaRepository<Lecture, Long> {
     @Query("SELECT l FROM Lecture l ORDER BY (SELECT COUNT(lk) FROM Liked lk WHERE lk.lecture.id = l.id) DESC")
     Page<Lecture> orderByLikedCount(Pageable pageable);
 
-    @Query("SELECT l FROM Lecture l ORDER BY l.curPNum DESC")
+    @Query("SELECT l FROM Lecture l ORDER BY l.cNum DESC")
     Page<Lecture> orderByCurPNum(Pageable pageable);
 
     @Query("SELECT l FROM Lecture l WHERE l.category.id = :categoryId")
diff --git a/majorLink/src/main/java/com/example/majorLink/repository/LikedRepository.java b/majorLink/src/main/java/com/example/majorLink/repository/LikedRepository.java
index a1afd57..34cacf6 100644
--- a/majorLink/src/main/java/com/example/majorLink/repository/LikedRepository.java
+++ b/majorLink/src/main/java/com/example/majorLink/repository/LikedRepository.java
@@ -9,4 +9,6 @@ public interface LikedRepository extends JpaRepository<Liked, Long> {
     Boolean existsByUserAndLecture(User user, Lecture lecture);
 
     void deleteByUserAndLecture(User user, Lecture lecture);
+
+    void deleteAllByLecture(Lecture lecture);
 }
\ No newline at end of file
diff --git a/majorLink/src/main/java/com/example/majorLink/repository/TuteeLectureRepository.java b/majorLink/src/main/java/com/example/majorLink/repository/TuteeLectureRepository.java
index bba3ec3..e8a7d10 100644
--- a/majorLink/src/main/java/com/example/majorLink/repository/TuteeLectureRepository.java
+++ b/majorLink/src/main/java/com/example/majorLink/repository/TuteeLectureRepository.java
@@ -1,5 +1,6 @@
 package com.example.majorLink.repository;
 
+import com.example.majorLink.domain.Lecture;
 import com.example.majorLink.domain.mapping.TuteeLecture;
 import org.springframework.data.jpa.repository.JpaRepository;
 
@@ -7,5 +8,5 @@
 import java.util.UUID;
 
 public interface TuteeLectureRepository extends JpaRepository<TuteeLecture, Long> {
-    Optional<TuteeLecture> findByUserIdAndLectureId(UUID userId, Long lectureId);
+    void deleteAllByLecture(Lecture lecture);
 }
\ No newline at end of file
diff --git a/majorLink/src/main/java/com/example/majorLink/repository/TutorLectureRepository.java b/majorLink/src/main/java/com/example/majorLink/repository/TutorLectureRepository.java
index 373f2ec..e6caa4f 100644
--- a/majorLink/src/main/java/com/example/majorLink/repository/TutorLectureRepository.java
+++ b/majorLink/src/main/java/com/example/majorLink/repository/TutorLectureRepository.java
@@ -1,5 +1,6 @@
 package com.example.majorLink.repository;
 
+import com.example.majorLink.domain.Lecture;
 import com.example.majorLink.domain.mapping.TutorLecture;
 import org.springframework.data.jpa.repository.JpaRepository;
 
@@ -7,6 +8,7 @@
 import java.util.UUID;
 
 public interface TutorLectureRepository extends JpaRepository<TutorLecture, Long> {
-    Optional<Object> findByUserId(UUID id);
     Optional<TutorLecture> findByLectureId(Long id);
+
+    void deleteAllByLecture(Lecture lecture);
 }
diff --git a/majorLink/src/main/java/com/example/majorLink/service/LectureService.java b/majorLink/src/main/java/com/example/majorLink/service/LectureService.java
index ae410b3..16cef2d 100644
--- a/majorLink/src/main/java/com/example/majorLink/service/LectureService.java
+++ b/majorLink/src/main/java/com/example/majorLink/service/LectureService.java
@@ -5,6 +5,7 @@
 import com.example.majorLink.dto.request.LectureRequestDTO;
 import org.springframework.data.domain.Page;
 
+import java.util.List;
 import java.util.UUID;
 
 public interface LectureService {
@@ -13,9 +14,9 @@ public interface LectureService {
     void DeleteLecture(UUID userId, Long lectureId);
 
     Page<Lecture> getLectureList(Integer page);
+    Lecture getLecture(Long lectureId);
 
     TuteeLecture addLecture(UUID userId, Long lectureId);
-    void cancelLecture(UUID userId, Long lectureId);
 
     Boolean toggleLike(UUID userId, Long lectureId);
 
@@ -23,4 +24,9 @@ public interface LectureService {
     Page<Lecture> getNewLecture(Integer page);
     Page<Lecture> getMostRecruitedLecture(Integer page);
     Page<Lecture> getLectureByCategory(Integer page, Long categoryId);
+
+    List<String> getMainCategory();
+    List<String> getSubCategory(String mainCategory);
+
+    Long getCategoryId(String mainCategory, String subCategory);
 }
\ No newline at end of file
diff --git a/majorLink/src/main/java/com/example/majorLink/service/LectureServiceImpl.java b/majorLink/src/main/java/com/example/majorLink/service/LectureServiceImpl.java
index c609dfd..93bf963 100644
--- a/majorLink/src/main/java/com/example/majorLink/service/LectureServiceImpl.java
+++ b/majorLink/src/main/java/com/example/majorLink/service/LectureServiceImpl.java
@@ -14,6 +14,7 @@
 import org.springframework.data.domain.PageRequest;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
 import java.util.UUID;
 
 @Service
@@ -46,8 +47,7 @@ public Lecture createLecture(UUID userId, LectureRequestDTO request) {
                 .curri(request.getCurri())
                 .info(request.getInfo())
                 .level(request.getLevel())
-                .pNum(request.getPNum())
-                .curPNum(0)
+                .pNum(request.getNum())
                 .time(request.getTime())
                 .day(request.getDay())
                 .startDate(request.getStartDate())
@@ -55,6 +55,7 @@ public Lecture createLecture(UUID userId, LectureRequestDTO request) {
                 .category(category)
                 .tag(request.getTag())
                 .tutor(user.getNickname())
+                .cNum(0)
                 .build();
 
         Lecture saveLecture = lectureRepository.save(lecture);
@@ -99,7 +100,7 @@ public Lecture updateLecture(UUID userId, LectureRequestDTO request, Long lectur
                 request.getCurri(),
                 request.getInfo(),
                 request.getLevel(),
-                request.getPNum(),
+                request.getNum(),
                 request.getTime(),
                 request.getDay(),
                 request.getStartDate(),
@@ -130,6 +131,10 @@ public void DeleteLecture(UUID userId, Long lectureId) {
             throw new IllegalStateException("You do not have permission to delete this lecture");
         }
 
+        tutorLectureRepository.deleteAllByLecture(lecture);
+        tuteeLectureRepository.deleteAllByLecture(lecture);
+        likedRepository.deleteAllByLecture(lecture);
+
         // Lecture 엔티티 삭제
         lectureRepository.delete(lecture);
     }
@@ -142,6 +147,13 @@ public Page<Lecture> getLectureList(Integer page) {
         return lecturePage;
     }
 
+    // 강의 상세 내용 조회
+    @Override
+    public Lecture getLecture(Long lectureId) {
+        return lectureRepository.findById(lectureId)
+                .orElseThrow(() -> new IllegalArgumentException("Invalid lecture ID"));
+    }
+
     // 강의 수강 신청
     @Override
     public TuteeLecture addLecture(UUID userId, Long lectureId) {
@@ -151,7 +163,7 @@ public TuteeLecture addLecture(UUID userId, Long lectureId) {
         Lecture lecture = lectureRepository.findById(lectureId)
                 .orElseThrow(() -> new IllegalArgumentException("Invalid lecture ID"));
 
-        if (lecture.getPNum() >= lecture.getCurPNum()) {
+        if (lecture.getPNum() <= lecture.getCNum()) {
             throw new IllegalStateException("The lecture is full");
         }
 
@@ -165,23 +177,6 @@ public TuteeLecture addLecture(UUID userId, Long lectureId) {
         return tuteeLectureRepository.save(tuteeLecture);
     }
 
-    // 강의 수강 취소
-    @Override
-    public void cancelLecture(UUID userId, Long lectureId) {
-        User user = userRepository.findById(userId)
-                .orElseThrow(() -> new IllegalArgumentException("Invalid user ID"));
-
-        Lecture lecture = lectureRepository.findById(lectureId)
-                .orElseThrow(() -> new IllegalArgumentException("Invalid lecture ID"));
-
-        TuteeLecture tuteeLecture = tuteeLectureRepository.findByUserIdAndLectureId(userId, lectureId)
-                .orElseThrow(() -> new IllegalArgumentException("Invalid user ID or lecture ID"));
-
-        lecture.subCurPNum();
-
-        tuteeLectureRepository.delete(tuteeLecture);
-    }
-
     // 강의 좋아요
     @Override
     public Boolean toggleLike(UUID userId, Long lectureId) {
@@ -237,4 +232,21 @@ public Page<Lecture> getLectureByCategory(Integer page, Long categoryId) {
 
         return lectureRepository.orderByCategoryId(categoryId, PageRequest.of(page, 10));
     }
+
+    // 메인 카테고리 조회
+    public List<String> getMainCategory() {
+        return categoryRepository.findMainCategory();
+    }
+
+    // 서브 카테고리 조회
+    public List<String> getSubCategory(String mainCategory) {
+        return categoryRepository.findSubCategory(mainCategory);
+    }
+
+    // 카테고리 ID 조회
+    public Long getCategoryId(String mainCategory, String subCategory) {
+        Category category = categoryRepository.findByMainCategoryAndSubCategory(mainCategory, subCategory)
+                .orElseThrow(() -> new IllegalArgumentException("Category not found"));
+        return category.getId();
+    }
 }
\ No newline at end of file