He was one of the best closers in Japan in the early 2000s, ranking third among Chunichi Dragons players in saves, after Kaku Genji and Hitoki Iwase.
In the 2007 Japan Series, he saved a perfect game with eight innings thrown by Daisuke Yamai.
In the semifinal game against Team Japan, Lee hit a dramatic go-ahead two-run home run in the bottom of the eighth inning off reliever Hitoki Iwase, which proved to be the winning runs in Korea's 6-2 win.