Career
Kim began to train judo at the age of 9. However he converted his sport into wrestling at age 13. In the quarterfinal bout, he beat 2008 Olympic silver medalist Vitaliy Rahimov of Azerbaijan 2-0.
In the final, Kim beat Tamás Lőrincz of Hungary with 2-0 (1:0, 2:0) to give South of Korea its first wrestling gold of the London Games.