OoOo(오넷) [필요해 (solo ver.)] 1.필요해 (solo ver.) Lyrics by OoOo(오넷) Composed by OoOo(오넷), SLIP, jelly Arranged by SLIP, jelly Guitar by SLIP Photo by 박건 Artwork by OoOo(오넷) Mixed by C.P.U at Monello MNL Studio Mastered by vinternoon