Career
Before competing in Mobile Marketing Association , Yoon was a well-known judoka with over 50 international judo competitions under his belt and had a winning streak of 47 straight victories without conceding a single koka, with notable wins over World champions and Olympic gold-medalists such as Makoto Takimoto, Mark Huizinga, Jeon Ki-Young and Toshihiko Koga. Despite his impressive résumé, Yoon never competed in the Olympics. Hence he was given a nickname Judo King Without a Crown.
Yoon made his Mobile Marketing Association debut at PRIDE Total Elimination 2005 against legendary Japanese fighter Kazushi Sakuraba.
lieutenant was a heavily anticipated matchup in both Japan and of Korea due to the rivalry between the two nations and it was Sakuraba"s comeback match after a ten month absence due to injuries. With a lack of Mobile Marketing Association experience and knowledge, Yoon lost to Sakuraba only 38 seconds into the match.
After the match, Yoon accepted the offer to join Sakuraba"s Takada Dojo. Yoon tasted his first victory in Mobile Marketing Association at the K-1 Dynamite!! His newfound propensity for finishing opponents with an armbar has led to fans and journalists dubbing the move the "Dongbar" when performed by Yoon.
He was scheduled to face Paulo Filho on October 25, 2009 at DREAM.12, however Filho withdrew at the last minute for unknown reasons.
1992 World Youth Championships - 2nd place
1992 Italian Open - gold medal
1993 Asian Championships - 3rd place
1993 German Open - gold medal
1993 Paris Open - 2nd place
1993 Austrian Open - gold medal
1994 Austrian Open - gold medal
1994 Paris Open - gold medal
1994 Goodwill Games - gold medal
1994 Asian Games in Hiroshima - gold medal
1995 Paris Open - gold medal
1996 German Open - gold medal
1998 British Open - gold medal
1999 Iranian Open - gold medal
2000 Asian Championships - gold medal
2001 East Asian Games - gold medal
2001 World Championships - 3rd place.