EXO-CBX is the first official sub-unit of the popular SM Entertainment group EXO. Comprised of members Chen, Baekhyun, and Xiumin, the group is often referred to as EXO ChenBaekXi in abbreviation of each member's first name.
EXO-CBX released their first mini album Hey Mama! on October 31 of 2016, taking their debut to the stage on the November 3 episode of M!Countdown. The group ended their promotions a few weeks later after winning their first #1 on the November 15 episode of MTV's The Show.