How old are you? [Credits] 1. Just like 10 Produced by San E, 시우(SIU) Lyrics by San E Composed by San E, 시우(SIU), 전홍준 Arranged by 시우(SIU), 전홍준 Keyboard by 시우(SIU) Guitar by 전홍준 Bass by 전홍준 Drum by 시우(SIU) Recorded by San E Mixed by FAME-J @FameUs Studio Mastered by FAME-J @FameUs Studio Executive Producer San E Producer San E Business Manager Hyun Chong Promotion & Artist Management Director 송치호 Artwork by PURPLET Presented by FameUs Entertainment