Career
Kim was considered one of the Big Three Judokas of the -73 kg class in South Korea, along with Lee Won-Hee and Wang Ki-Chun. In the gold medal match, he defeated two-time Olympic medalist Leandro Guilheiro of Brazil by scoring a waza-ari with ouchi-gari in extra time. Kim avenged his Beijing 2008 Olympic Games loss to Ole Bischof in round of 16.
He beat Srdjan Mrvaljevic of Montenegro in the final match by scoring a waza-ari with osaekomi-waza. Kim has had several nicknames over the course of his career, including "Man of One Arm Wins" for his successes through injury, "Korean Tiger" for his aggressive play and iconic status in South Korean judo, and "Energizer Bunny" for his quick and relentless physical style of judo. He is known for fighting in major competitions, including the Olympics and World Championships, despite plagued with injuries.
Kim was granted exemption from South Korea's mandatory military service in 2010, after winning at the Guangzhou Asian Games. Kim is a devout Christian, and prays before and after his fights. (as of 30 October 2015).