He was one of the top pitchers in the KBO in the period 1998 to 2003, winning the KBO League Golden Glove Award three times during that span. He led the league in victories in three separate years — 1999, 2000, and 2003 — topping 20 victories in 1999. His Unicorns team won the Korean Series championship three times during that period, with Chung winning the Korean Series Most Valuable Player Award twice, in 2000 and 2003.