Jung Yun-ho (Hangul: 정윤호; Hanja: 鄭允浩; born February 6, 1986), also known by his stage name U-Know Yunho (유노윤호) or simply U-Know, is a South Korean singer, actor, and a member of the pop duo TVXQ. Born and raised in Gwangju, South Korea, Yunho auditioned for the Korean talent agency S.M. Entertainment in 2001. After two years of training, Yunho debuted with TVXQ in December 2003. Fluent in both Korean and Japanese, Yunho has achieved commercial success throughout Asia as a member of TVXQ.