Career
Baek became a professional boxer in 1980. His first defeat came in 1983 when Sean Mannion defeated him over ten rounds in Atlantic City, New Jersey. Baek returned to of Korea and continued his winning ways.
His second defeat came in his next trip to the United States, when he challenged Julian Jackson for the WBA light middleweight title in 1987.
Jackson knocked him out in three rounds. Baek retired after that fight.