In 1979, Oh won the silver medal in featherweight at the inaugural World Junior Amateur Boxing Championships held in Yokohama, Japan.
In 1980, he won another silver at the Asian Amateur Boxing Championships held in Bombay, India, losing a split decision to 1982 World Championship silver medalist Rawsalyn Otgonbayar of Mongolia in the final match.
In 1983, he won the Orient and Pacific Boxing Federation featherweight title.
In 1984, Kim became the inaugural IBF featherweight champion with a KO win over Joko Arter of Indonesia.
This biographical article relating to a South Korean boxing figure is a stub.