Jang Woo Hyuk is a South Korean rapper. He debuted under SM Entertainment as one of the members of the 5 member boyband H.O.T. in 1996.
As a member of H.O.T. he was known for being a dancer of the group, and was known for his strong vocal screams in his rap. His nicknames have been "Hammer Boy" for his famous locking dance from H.O.T.s debut single; Candy. When H.O.T disbanded in 2001, Woo Hyuk and two other H.O.T members; Tony An and Lee Jae Won dropped out of SM and formed the trio JTL.