뭐가 문제였을까 [Credit] Lyrics by 영채(0CHAE), 차우주 Composed by 영채(0CHAE), 차우주, olee, yowoon (여운) Arranged by yowoon (여운), 구민우 Guitar by 구민우 Drum by yowoon (여운) Mix & Mastered by 전찬민 @Mat Kor Studio Photo by 나승윤 @siryun_film Photoshop used by영채(0CHAE), 나승윤 @siryun_film