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

He won a gold medal in welterweight at the 2002 Asian Games, beating Non Boonjumnong in the semifinals.

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

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

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