Best known for his work with the boy band Beast, this South Korean vocalist and rapper contributed to such recordings as Beast Is The B2ST and Mastermind. Also an actor, he won a 2010 MBC Entertainment Award for his recurring role in the sitcom All My Love.
Early in his career, he trained with JYP Entertainment and subsequently performed with the rapper AJ (Lee Gi-kwang).
He and several of his Beast bandmates earned scholarships to Dongshin University.
He was born and raised in Goyang, South Korea.
He and Kim Tae-yeon were both DJs for a popular MBC Radio music program.