Koo is a left-handed pitcher despite being born right-handed. As a child, he suffered an injury which forced him to become left-handed. He broke his right arm so badly that he had to use his left hand primarily. Koo attended Hanyang University.\n', '

Koo began his professional career in 1993 with the Hanwha Eagles of the Korea Baseball Organization. In 1996, he won both a Gold Glove Award and the MVP of the KBO with a 1.88 ERA, 18 wins, 24 saves and 183 strikeouts in 139 innings pitched.\n', '

Koo played for the South Korean national Olympic team in the 2000 games. He led his team to a bronze medal in 2000 by pitching a 3-1 complete game victory over Japan.\n', '

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