He won the gold medal in the bantamweight division (-63 kg) at the 2009 World Taekwondo Championships in Copenhagen, Denmark.

At the 2009 World Championship, Yeom won the very controversial gold medal fight against Reza Naderian of Iran following a highly disputed 4–2 final score.

Iran requested a video replay but the referee refused.

[2] After the match, many South Korean media criticized about the controversial judgement and Yeom's unsportsmanlike ending.

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