‘oftn' single album [Firework] [Credits] Produced by oftn 01. Firework (feat. Sonny Zero) Composed by oftn, Sonny Zero Arranged by oftn, SIM2 Lyrics by Sonny Zero Guitar by 장_난 Keyboard by SIM2 Bass by 이주원 Midi Programming by SIM2 Mixed & Mastered by 황동찬 @Restonmemory A&R 신선영 Management / ATCM @atcm.kr Executive Producer 정태수