[Credit]

1. Once (일단, 한번)

Composed by 사공예원, 유지헌
Arranged by 유지헌
Lyric by 사공예원
Vocal by 사공예원
Guitar by 홍성진
Piano by 유지헌
Drum by 최시은

2. 관계는 타이밍

Composed by 유지헌
Arranged by 유지헌
Lyric by 유지헌
Male Vocal by 이성환
Female Vocal by 사공예원
Guitar by 홍성진
Piano by 유지헌

3. 잠들지 않는 밤

Composed by 이성환, 유지헌
Arranged by 유지헌
Lyric by 이성환, 유지헌
Vocal by 이성환
Guitar by 홍성진
Piano by 유지헌

Produced by 유지헌 (Dead Bart)
Engineered by 김바나나
Mixed and Mastered by 유지헌 (Dead Bart)