BTOB’s vocal line has officially teamed up as a sub-unit and debuted as BTOB-BLUE. The vocal line, consisting of Eunkwang, Changsub, Hyunsik and Sungjae have released their first digital single, “Stand By Me”.

The beautifully heartbreaking track sings of lost love and showcases the member’s beautiful vocals, as seen previously in BTOB’s ballad trilogy.

The gorgeous and classy music video is shot in one continuous take, directed solely in a bar and directed by no other than fellow group member, Peniel.

Check out this amazing debut and tell us what you think!