About Yoon Kye-sang
Yoon Kye-sang (Korean: 윤계상; 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). == Career == === 1999–2004: Pop star beginnings === In 1997 Yoon answered an advertisement for Park Joon-hyung's project music group and had auditioned with aspirations of becoming a rock star. Along with Danny Ahn, Son Ho-young, Kim Sun-a and producer and singer-songwriter Park Jin-young, the group was initially called "GOT6". Kim Sun-a left to pursue acting and was replaced by Kim Tae-woo. The group became a five-member boy band called g.o.d, short for "Groove Over Dose", and debuted in January 1999.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.