[1] He produced a remarkable tally of three career medals, including a silver in the 55-kg division at the 2003 World Wrestling Championships in Créteil, France, and also finished seventh at the 2004 Summer Olympics, representing his nation South Korea.

Im highlighted his sporting career at the 2003 World Wrestling Championships in Créteil, France, where he picked up a silver medal in the 55-kg division, losing 5–6 to three-time Olympic veteran Dariusz Jabłoński of Poland.

[2] Because of his unprecedented success, Im emerged as one of the top favorites to win a medal for the Olympic Games, and went on to grab another silver at the Asian Championships in Almaty, Kazakhstan by the following year.

[2][3] He dominated the prelim pool by pulling into a 4–4 tie over Kazakhstan's Nurbakyt Tengizbayev, and dismantling another Olympic veteran Marian Sandu of Romania with a 3–6 verdict to secure him a spot for the next round.

As he faced off against eventual Olympic silver medalist Geidar Mamedaliyev of Russia, Im could not hold him tightly to score enough points and lost the match 3–0, placing seventh in the final standings.