Question:  "what U need?"  is a single, recorded by which Chinese singer, for his debut extended play "Lose Control" , Zhang Yixing (born (1991--) 07, 1991 ), better known by his stage name, which is?
Sentence (from "Lay (entertainer)"): He is a member and main dancer of the South Korean-Chinese boy group Exo and its sub-unit Exo-M.
Relevant evidence: No