Kim turned pro in 1985 and captured the WBC and The Ring flyweight titles with a decision win over Sot Chitalada in 1988.
[1] In 1991 he won the WBA flyweight title with a decision win over Elvis Álvarez.
[2] In 1994 Kim returned for his biggest fight, for he WBA flyweight title against Saen Sor Ploenchit.
The fight was staged a half mile from the Bridge over the River Kwai in Kanchanaburi, Thailand (Kleebbua Stadium or Kanchanaburi Stadium).
Although Ploenchit was dropped in round one, he went on to easily outbox the former world champion Kim.