1,2,3,4 (Feat. 문수진) 작사: 주은,문수진,Summer Soul 작곡: 주은,베리(ROCOBERRY),Nois upGrader,문수진,김창현 편곡: Nois upGrader,김창현 BASS 이관규 KEYBOARD 김창현 GUITAR 박신원 CHORUS 주은 RECORDING ENGINEER 권유진@ DOOBDOOB STUDIO MIXING ENGINEER 김현곤@ DOOBDOOB STUDIO MASTERING ENGINEER 권남우@ 821 STUDIO EXECUTIVE PRODUCER 안영민(BROTHERHOOD ENTERTAINMENT),바이올렛 유토피아 PRODUCER 주은,베리(ROCOBERRY) RECORDING ENGINEER 권유진@DOOBDOOB STUDIO MIXING ENGINEER 김현곤@DOOBDOOB STUDIO MASTERING ENGINEER 권남우@821SOUND PROJECT MANAGER 안영배 ALBUM DESIGN Rie CREATIVE DIRECTOR 고경표 MV DIRECTOR ND Kim(INDEED)