그리움의 이유. 너를 추억하는 것인 줄 알았지만, 알고 보니 그 시절의 해맑은 나를 그리던 시간이었다. [CREDITS] 1. 이유 Produced by 너와나의21세기 Composed & Written by 구오(GUO) Arranged by 너와나의21세기 Vocals by 구오(GUO) Keyboards by 주봉환 MIDI Programming by 주봉환 Recorded by 주봉환 Mixed & Mastered by 주봉환 Cover Art by 이정훈, 김재민, 박은미 2. 나의 세계(Demo) Produced by 너와나의21세기 Composed & Written by 구오(GUO) Arranged by 너와나의21세기 Vocals by 구오(GUO) Keyboards by 주봉환 MIDI Programming by 주봉환 Recorded by 주봉환 Mixed & Mastered by 주봉환