As a junior at Yongma High School in Masan, South Korea, Jang was selected by the Hyundai Unicorns with the 89th pick in the 2nd round (97th overall) of the 2002 KBO Draft. However, he entered Kyungsung University upon graduation from high school instead of turning pro directly.
In 2005, Jang was selected for the South Korea national team again, and participated in the Baseball World Cup held in the Netherlands. He helped the team win the silver medal, finishing 4th in strikeouts (24). He pitched an eight shutout inning victory over South Africa in the preliminary round, and appeared in seven of South Korea's 11 games.
In March 2009, Jang was called up to the South Korea national baseball team for the 2009 World Baseball Classic prior to the 2009 KBO season, but had a disappointing performance, pitching to a 5.06 ERA. In South Korea's second game in Round 1 against Japan, Jang came on in relief in the 3rd inning but allowed 3 runs and 4 hits in 2.2 innings pitched. He started the Pool 1 title match against Japan in Round 2, but went only 3 innings allowing 2 runs and 5 hits including the solo home run by Seiichi Uchikawa. Jang struggled the 2009 KBO season with a 5.54 ERA and a record of 4-8, by far the worst of his career.
After the 2009 season, Jang was traded to the Samsung Lions with ₩3 billion won ($3 million). He bounced back in the 2010 season to finish sixth in the league in ERA (3.46), seventh in wins (13) and eighth in strikeouts (115).
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