Amateur career

Byun is perhaps best known for protesting against a decision at the 1988 Seoul Olympics by refusing to leave the ring after losing a controversial 4-1 decision in the bantamweight competition. He was penalized for head-butting his competitor, Aleksandar Hristov of Bulgaria. He sat by himself in the ring for over an hour. Eventually, match officials turned the lights out and left him in darkness.

Olympic results

• Defeated Jean-Marc Augustin (France) 5-0
• Lost to Aleksandar Hristov
  Aleksandar Hristov
  Aleksandar Khristov is a retired boxer from Bulgaria, who became world champion and represented his native country at the 1988 Summer Olympics in Seoul, South Korea. There he won the silver medal in the bantamweight division...
  
   (Bulgaria) 1-4

Professional career

Byun turned pro in 1990 and in 1993 defeated Victor Rabanales

Victor Rabanales

Victor Manuel Rabanales was a Mexican boxer in the Featherweight division. He is a former WBC FECARBOX and the WBC Bantamweight Champion...

 for the WBC bantamweight title in only his 9th fight by decision. He lost the belt later that year to Yasuei Yakushiji

Yasuei Yakushiji

is a former professional boxer who fought in the bantamweight division. He successfully defended the WBC bantamweight title four times during his career.- Biography :Yakushiji began boxing under influence of his father, who was an amateur boxer...

, and lost a rematch to Yakushiji the following year. He retired after the loss.