EXO XIUMIN与VIVIZ 银河合作献上的《후우（Who？）》是一首中等节奏，讲述一对不是以朋友身份，而是以恋人身份来迎接这个春天的情侣，可爱氛围满满的歌曲。 作曲家Full8loom (장준호, 진리)为音色酷似春天的XIUMIN和银河二人特别创作的歌曲，将爱情萌芽时的那份悸动和甜蜜加倍。 [Credits] Lyrics by 진리(Full8loom) Composed by 영광의얼굴들(Full8loom), 진리(Full8loom) Arranged by 영광의얼굴들(Full8loom) Guitar by 고명재 Bass by 박순철 Keyboard by 장준호 Background Vocals by 이지원 Recorded by 정기홍, 최다인, 이찬미 @ Seoul Studio Mixed by 조씨아저씨 @ JoeLab Mastered by 권남우 @ 821 Sound Mastering Producer 김정하, 임가원, 이다임