In 1981, he became the first open division champion to represent South Korea at the Asian Judo Championships in Jakarta.

Ha represented South Korea at the 1984 Summer Olympics, and claimed the gold medal in the men's half heavyweight division (‍–‍95 kg) by defeating Brazil's Douglas Vieira in the final.

Ha also competed at the 1988 Summer Olympics, but did not win a medal.

[1][2] Ha retired shortly after the Seoul Olympics and has been working as a physical education professor at Dong-A University.

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