[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

ⓒ Cosm