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Joon is a member of the Korean group MBLAQ. He was an actor for commercials before he joined the group. He had a small role in the Korean sitcom "That person is coming". In 2009 Joon also appeared in "Ninja Assassin" as the teenage Raizo. He then became a part of the boy band MBLAQ. In 2010, he has been cast in two dramas, titled "Jungle Fish 2", in which he will play opposite JiYeon from T-ara, and also "Stay-at home-mom Kim Kwang Ja", also known as Housewife Kim Kwang Ja's third activity, which aired on the 22nd of September 2010. He is a singer signed to J.Tune Entertainment, where he is one of the five members of Korean boy band MBLAQ, active in South Korea.
Majored in Dance at Korea National University of Arts.
He used to train as a dancer, especially contemporary dance.
Provided the voice of Gnomeo for the South Korean release of the movie Gnomeo.
Model for underwear brand "Kiss Republic".
Member of MBLAQ, a South Korean boy band.
Appeared in the South Korean movie version of Jungle Fish 2.
