In 1983, Chun won the silver medal in lightweight (–60 kg) at the 3rd Boxing World Cup in Rome, Italy.

Next year, he won the bronze medal in the lightweight division at the 1984 Summer Olympics in Los Angeles, California.

Chun defeated former two-time WBC Super Featherweight champion Rafael Limón in 1989.

After going 18–1, he was matched up against Joey Gamache for the WBA Lightweight title in Portland, Maine in 1992, but was defeated by 9-round TKO.

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