Yoon Kye-sang (born December 20, 1978) is a South Korean actor and singer. He began his career in 1999 as part of the K-pop boy band g. o. d, then left the group in 2004 and pursued an acting career. He made his acting debut in the film Flying Boys (2004), for which he won Best New Actor at the Baeksang Arts Awards. Yoon became active in both television and film, with leading roles in romantic comedies such as My 19 Year Old Sister-in-Law (2004) and Who Are You? (2008) and the melodrama Crazy for You (2007), as well as more serious fare in The Moonlight of Seoul (2008) and The Executioner (2009). After a supporting turn in the hit series The Greatest Love (2011), he returned to the big screen in the well-received indie Poongsan (2011).