Byun Baek-hyun, better known mononymously as Baekhyun, is a South Korean singer, songwriter and actor. Baekhyun began training under SM Entertainment in 2011. A few months later, he made his debut in 2012 as a member of the South Korean-Chinese boy group Exo, its sub-group Exo-K and later on its sub-unit Exo-CBX. He is also the leader of South Korean supergroup SuperM.