[Credit]01.둘이라는 건작사 : 9999작곡 : 9999편곡 : 9999Composed by 9999Lyrics by 9999Arranged by 9999Keyboards by 9999Drum by 9999Bass by 9999Guitar by 정수완Chorus by 9999Recorded by 9999Mixed by 9999 at OnePercent SpaceMastered by 9999 at OnePercent Space02.둘이라는 건 (Inst.)작곡 : 9999편곡 : 9999Composed by 9999Lyrics by 9999Arranged by 9999Keyboards by 9999Drum by 9999Bass by 9999Guitar by 정수완Mixed by 9999 at OnePercent SpaceMastered by 9999 at OnePercent SpaceExecutive Producer 9999Producer 9999Mixing & Mastering Engineer 9999 at OnePercent SpaceArt & Design by 9999Presented by With Good People