"Guess who's back? Hello, I'm Yoon!" Kang Seung-yoon (born January 21, 1994), known as Seungyoon, is a South Korean singer-songwriter, actor, and leader of boy group Winner. In 2010, he participated in the reality television singing contest Superstar K2 and finished in fourth place. In January 2011, he became a trainee under YG Entertainment and went on to debut as a solo artist in July 2013 and as the leader of Winner in October 2013.