“BIRTHDAY” is the debut song by soloist Somi. The song is a funky, clap-happy piece of hip-pop masterpiece and a fun and bright summer track to lighten up listeners.

After more than two years since the 2017 disbandment of temporary girl group I.O.I, which she was a part of, Somi finally debuted under THE BLACK LABEL.

Somi co-composed the song with Teddy, 24, and Bekuh Boom.