Choi turned professional in 1987 and captured the WBA light flyweight title in 1991 in only his 10th pro bout in with a decision win over Bong-Jun Kim. He defended the belt 4 times before losing it to Hideyuki Ohashi in 1992. He later moved up in weight and in 1995 captured the WBA light flyweight title with a decision win over Leo Gamez. He lost the belt in 1996 to Carlos Murillo and retired after the bout.
|WBA Minimumweight Champion
1991 Feb 2 – 1992 Oct 14
|WBA Light Flyweight Champion
1995 Feb 4 – 1996 Jan 13
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