WooIn [Zzz]   사랑해, 잘 자   [Credit] Composed by WooIn Lyrics by WooIn Arranged by WooIn E.Guitar 김기원 Vocal WooIn   Recorded by 최일웅, 신홍재 at pondsound studio Mixed & Mastered by 이병렬 Album art by 김시진 Photograph by 김시진 M.V production by 송정헌