Kim received a Master's degree in physical education from Sangji University in South Korea.

Kim qualified for the Athens Games by winning the gold medal at the 2004 Asian Amateur Boxing Championships in Puerto Princesa, Philippines.

He did not compete at the 2005 and 2007 world championships and was beaten in the first round at the 2006 Asian Games by Angkhan Chomphuphuang.

He easily qualified for the 2008 Summer Olympics, though, by beating Davran Khabirov and Dilshod Mahmudov.

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