Yoon (윤; previously known as Seungyoon (강승윤)) is a South Korean singer, songwriter and actor. He is the leader of the boy group WINNER.
He was a contestant on Superstar K2 and finished fourth overall. He signed with YG Entertainment in 2011 before making his solo debut with the single "It Rains" on July 16, 2013. He then participated in the survival reality show WIN: Who Is Next, competing as Team A, who won the competition and would debut as WINNER.