- Bats Left, Throws Left
- Height 6' 0", Weight 204 lb.
- High School Busan Commercial High School
Lee debuted in the Korea Baseball Organization as a teenager in 1998, with a 1.74 ERA in 15 outings for the OB Bears. In 1999, he went 8-4 with a 4.76 ERA in 77 games. In 2000, he was 5-6 with a save and a 5.02 ERA in 78 appearances. His record in '01 was 9-6 with 3 saves and a 3.62 ERA. He finished 6th in the league in ERA. The Baseball Almanac lists him as the only effective pitcher in the high-scoring 2001 Korean Series; he won two games to help the Bears win the Series. During the 2001 Baseball World Cup, Lee led South Korea with 5 games pitched. He went 1-1 with a 1.98 ERA and fanned 20 in 13 2/3 IP. He tied for 5th in the Cup in strikeouts behind Chih-Chia Chang, Roger Deago, Shugo Fujii and Jose Contreras.
In 2002, the Bears southpaw pitched 78 games again; he was 2-4 with a save and a 4.67 ERA. In the 2002 Intercontinental Cup, Lee tied Byong-yong Chei for the Korean lead with 5 games. He allowed only one hit in 7 2/3 IP and struck out 12; on the other hand, he walked 5 and gave up 3 unearned runs. In the Gold Medal game, he walked Frederich Cepeda and struck out Kendry Morales in the 8th inning of a 3-1 Korean loss.
The next year, Hei-chun threw 83 games, going 5-3 with a 3.93 ERA; being used more as a LOOGY now, he only worked 55 innings. In 2004, Lee went 2-2 with a save and a 5.88 ERA in 79 games. 2005 was better as Lee became a starting pitcher and had a 7-4, 3.95 record. In 2006, he continued to progress, going 8-6 with a 2.79 ERA and 119 hits (just 4 homers) in 142 innings. He pitched in the 2006 Asian Games.
Lee spent 2007 in the South Korean Armed Services. In 2008, he returned to the diamond and fell to 7-5, 4.69.
Through 2008, he had pitched 559 games in the KBO, going 53-40 with 6 saves and a 4.16 ERA. In 902 innings, he allowed 868 hits, walked 531 and struck out 682.
Lee became a free agent that off-season and fielded offers from teams in Japan. He signed with the Tokyo Yakult Swallows for $800,000 over 2 years, following fellow Korean hurler Chang-yong Lim to Yakult. He began the season in the minor leagues but debuted in Nippon Pro Baseball on May 4, starting a game against the Hiroshima Carp. He allowed 5 hits and 2 runs in 2 1/3 IP before leaving the game; Yakult went on to win 5-3.