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 "S.M. The Performance"): The group made their first appearance on "SBS Gayo Daejeon" in December 2012.
Relevant evidence: No