[1] In the final, he lost to three-time Olympic champion Tadahiro Nomura by ippon only fourteen seconds into the match.

[citation needed] He moved up in weight to the 66 kg class, and won a gold medal at the 2003 Asian Judo Championships in Jeju.

However, Jung failed to qualify for the 2004 Olympic Games by losing to Bang Gui-man in the national qualification match.

Jung was replacing American Top Team's Gesias Calvancanti, who tore a ligament in his left knee while training to fight Aoki.

Although Jung lost by unanimous decision, he proved to be a formidable opponent in his mixed martial arts debut.