[Credits] 1. 문제 (Feat. 김승민) Lyrics by RYUL, 김승민 Composed by RYUL, 김승민, diff, Cosmic Boy Arranged by Cosmic Boy
2. 문제 (Inst.) Composed by RYUL, 김승민, diff, Cosmic Boy Arranged by Cosmic Boy
Chorus by RYUL, 김승민 Piano by Cosmic Boy, 최준화 Drum by Cosmic Boy Bass by 정승현 Guitar by 조형구 Synthesizer by Cosmic Boy, 최준화 String by Cosmic Boy Midi Programming by Cosmic Boy All tracks Mixed & Mastered by 김규빈 @6elong
[Cosm] Artist : RYUL Executive Director : Cosmic Boy A&R : Shin Narae, Won Minjoo Management : Lee Jinwook, Lee Jusang Management support : Jo Hayoung
