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Kim was born and raised in Gyeonggi-do, South Korea.
He has an older fraternal twin brother named Kim Junho, who is also a singer mainly active in Japan and China where he is more well known by his stage names JUNO and ZUNO.
At a voluntary arbitration at the Seoul Central District Court, SM Entertainment finally agreed that its contract ended 31 July 2009, and that it would no longer interfere with JYJ’s endeavors in Korea.
Throughout his career as TVXQ's member, Kim had written and composed several songs that have appeared on the group's Korean and Japanese releases. At TVXQ's second Asian tour, he performed a solo self-composed dance track called "My Page".
He graduated high school along with fellow member Park Yoochun in 2007.