Jung Yunho (born February 6, 1986) is the leader of the South Korean boy band TVXQ/DBSK/Dong Bang Shin Ki. He is also known by his stage name U-Know and is a Korean singer, dancer, rapper, and occasional actor.
U-Know was born and raised in Gwangju, South Korea. He has a younger sister, Jung Ji-hye. At the age of thirteen he joined SM Entertainment, after winning a dance competition. Before debuting in 2003, U-Know appeared in label-mate Dana's music video for her song "Diamond" as a backup dancer and rapper. He has said he chose his stage name to be U-Know because as the leader of the group, he wants to understand everybody as in "I know you."
Musical CareerFor The 2nd Asia Tour Concert 'O', U-know performed his self-composed song Spokesman. He and band-mate Micky are also featured rappers in "Heartquake" from Super Junior's Third Album, Sorry, Sorry. For the Tohoshinki 4th Live Tour 2009: The Secret Code in Tokyo Dome, U-know performed his self-composed song Checkmate in Japanese.
U-Know has appeared on two televised shows with TVXQ, Banjun Theater and Vacation. In 2006, U-know made an appearance guest in Rainbow Romance. In July of 2009, Jung was cast in the MBC miniseries "Heading to the Ground."