Question: S.M. The Performance, is a dance project group, formed by S.M. Entertainment in 2012, The group consists of members of other groups of S.M., including which South Korean singer and actor, a member of the South Korean-Chinese boy group EXO and its sub unit EXO-K, better known as who?
Sentence (from "Byun Baek-hyun"): Byun Baek-hyun (born May 6, 1992), better known mononymously as Baekhyun, is a South Korean singer and actor.
Relevant evidence: No