[1] He represented his nation South Korea at the 2008 Summer Olympics, and also claimed a silver medal as a member of the 4×100 m medley relay team at the 2010 Asian Games in Guangzhou, China.

Kim competed for the South Korean swimming team in the men's 200 m backstroke at the 2008 Summer Olympics in Beijing.

[3] Pulling from the near bottom of the pack at the 150-metre turn in heat three, Kim put up a late resistant surge on the final stretch to hit the wall with a fifth-place time and his new personal best in 2:00.72.

Kim failed to advance to the semifinals, as he placed twenty-sixth out of 42 swimmers in the preliminary heats.

[4] On May 13, 2014, Kim received a two-year suspension from the Korean Swimming Federation and Korea Anti-Doping Disciplinary Panel, after he was tested positive for the clenbuterol.