He won a
Light Flyweight bronze medal at the
1982 World Amateur Boxing Championships. Heo captured a
Flyweight silver medal in the
1983 Boxing World Cup in Rome, Italy, beating Australian boxing legend
Jeff Fenech by unanimous decision in the semifinals. Next year, Heo participated in the
1984 Summer Olympics. However, he, in a major upset, lost to
Eyüp Can of Turkey by split decision in the quarterfinals. Heo served as a middle school teacher in
Yeosu,
Jeollanam-do. ==Results==