오반의 ‘불행’ 시리즈 중 두 번째 싱글 ‘행복’을 공개한다. [CREDIT] 1. 행복 작곡: 피아노맨 작사: 오반 편곡: 피아노맨, J.Litz Produced by OVAN, PIANO MAN Composed by PIANO MAN Arranged by PIANO MAN Lyrics by OVAN Piano by PIANO MAN Orchestra by J.Litz Mixed by 김대현(HEADBANG) Mastered by 권남우(821 Sound) COVER by Mr.Black Executive Produced by Romantic City 2. 행복(INST.)