Kim became a member of the South Korean senior national team in 2010 when he won the gold medal at the Asian Wrestling Championships.

In December 2011, Kim won the gold medal in the men's Greco-Roman 66 kg at the Pre-London Olympics Test Event.

In the final, Kim beat Tamás Lőrincz of Hungary with 2-0 (1:0, 2:0) to give South Korea its first wrestling gold of the London Games.

He then defeated Yang Bin of China during the repechages and Božo Starčević of Croatia to win the bronze medal.

This biographical article relating to a South Korean sport wrestler or wrestling coach is a stub.