diff --git a/src/main/java/com/threestar/trainus/domain/lesson/student/service/StudentLessonService.java b/src/main/java/com/threestar/trainus/domain/lesson/student/service/StudentLessonService.java
index 5a86995..e2cbe05 100644
--- a/src/main/java/com/threestar/trainus/domain/lesson/student/service/StudentLessonService.java
+++ b/src/main/java/com/threestar/trainus/domain/lesson/student/service/StudentLessonService.java
@@ -172,8 +172,14 @@ public LessonApplicationResponseDto applyToLesson(Long lessonId, Long userId) {
 			throw new BusinessException(ErrorCode.LESSON_NOT_AVAILABLE);
 		}
 
+
+
 		// 선착순 여부에 따라 저장 처리 분기
 		if (lesson.getOpenRun()) {
+			// 신청 시간 체크
+			if (java.time.LocalDateTime.now().isBefore(lesson.getOpenTime())) {
+				throw new BusinessException(ErrorCode.LESSON_NOT_YET_OPEN);
+			}
 			// 바로 참가자 등록, 인원수 증가
 			LessonParticipant participant = LessonParticipant.builder()
 				.lesson(lesson)
diff --git a/src/main/java/com/threestar/trainus/domain/lesson/teacher/repository/LessonRepository.java b/src/main/java/com/threestar/trainus/domain/lesson/teacher/repository/LessonRepository.java
index f467fff..1392c29 100644
--- a/src/main/java/com/threestar/trainus/domain/lesson/teacher/repository/LessonRepository.java
+++ b/src/main/java/com/threestar/trainus/domain/lesson/teacher/repository/LessonRepository.java
@@ -218,7 +218,7 @@ int countCreatedLessons(
 		      AND (:district IS NULL OR l.district = :district)
 		      AND (:dong IS NULL OR l.dong = :dong)
 		      AND (:ri IS NULL OR l.ri = :ri)
-		      AND MATCH(l.lesson_name, l.description) AGAINST(:search IN BOOLEAN MODE)
+		      AND MATCH(l.lesson_name) AGAINST(:search IN BOOLEAN MODE)
 		    ORDER BY 
 		      CASE WHEN :sort = 'LATEST' THEN l.created_at END DESC,
 		      CASE WHEN :sort = 'OLDEST' THEN l.created_at END ASC,
@@ -248,7 +248,7 @@ SELECT COUNT(*) FROM (
 		          AND (:district IS NULL OR l.district = :district)
 		          AND (:dong IS NULL OR l.dong = :dong)
 		          AND (:ri IS NULL OR l.ri = :ri)
-		          AND MATCH(l.lesson_name, l.description) AGAINST(:search IN BOOLEAN MODE)
+		          AND MATCH(l.lesson_name) AGAINST(:search IN BOOLEAN MODE)
 		        LIMIT :limit
 		    ) t
 		""", nativeQuery = true)
diff --git a/src/main/java/com/threestar/trainus/global/exception/domain/ErrorCode.java b/src/main/java/com/threestar/trainus/global/exception/domain/ErrorCode.java
index 0185259..d225ab2 100644
--- a/src/main/java/com/threestar/trainus/global/exception/domain/ErrorCode.java
+++ b/src/main/java/com/threestar/trainus/global/exception/domain/ErrorCode.java
@@ -92,6 +92,7 @@ public enum ErrorCode {
 	DUPLICATE_LESSON(HttpStatus.CONFLICT, "동일한 이름과 시간으로 이미 생성된 레슨이 있습니다."),
 	LESSON_TIME_OVERLAP(HttpStatus.CONFLICT, "해당 시간대에 이미 다른 레슨이 예정되어 있습니다."),
 	LESSON_NOT_AVAILABLE(HttpStatus.BAD_REQUEST, "신청 불가능한 상태의 레슨입니다."),
+	LESSON_NOT_YET_OPEN(HttpStatus.BAD_REQUEST, "아직 신청 가능한 시간이 아닙니다."),
 
 	// 409
 	ALREADY_APPLIED(HttpStatus.CONFLICT, "이미 신청한 레슨입니다."),