An is a nephew of Olympic gold medalist Ahn Byeong-keun.

At the age of 15, An moved to Japan and continued his judo career in Fukuoka.

Upon graduation from Yamanashi Gakuin University in 2006, he came back to Korea and joined the Pohang City Hall judo club.

On 26 August 2009, An won a bronze medal in the ‍–‍66 kg division at the 2009 World Judo Championships in Rotterdam, Netherlands.

This biographical article related to South Korean judo is a stub.