Hollow Young Single [뭐해] 앨범 소개글[Credits]01. 뭐해 (Feat. CIKA)Lyrics by Hollow Young, CIKAGuitar by Hollow YoungKey by Hollow YoungDrum by Hollow YoungBass by Hollow YoungComposed by Hollow YoungArranged by Hollow YoungArtwork by Hollow YoungMixed & Mastered by James ChildRecorded at Hollowship