In 2004, he won the gold medal in heavyweight and was named MVP at the World Youth Taekwondo Championships held in Suncheon, South Korea.

In 2005, Nam won the gold medal in heavyweight at the Summer Universiade, and claimed another gold medal at the 2006 World Cup Taekwondo in Bangkok, Thailand.

Nam won the silver medal at the 2009 World Taekwondo Championships held in Copenhagen, Denmark.

[1] This was a step up from the championships held in Beijing 2007, where he won bronze.

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