The group initially debuted with twelve members separated into two subgroups, EXO-K (Suho, Baekhyun, Chanyeol, D.O., Kai, and Sehun) and EXO-M (Xiumin, Lay, Chen and former members Kris, Luhan and Tao), performing music in Korean and Mandarin respectively. They have been active as a single group since 2014 while continuing to release and perform music in multiple languages. The group became nine after the departures of Kris, Luhan and Tao. Since 2016, three members, Chen, Baekhyun and Xiumin, have also been active as a subunit named EXO-CBX, incorporating the initials of each member's stage names. Their Chinese member Lay has released two solo chinese albums in 2016 and 2017.