During his four collegiate years, he was regularly called up to the South Korean national team and showed promising performances in the major international competitions .
In 2003, he pitched over 100 innings (100.1) and posted 6 wins, 3 saves and 11 holds with a career-low 4.31 ERA, taking a role as a utility pitcher.
He came back to the team in 2008 but hardly seized an opportunity to pitch, spending most of his time in the farm league.
As Australian closer Brad Thomas left the Eagles for the Detroit Tigers in MLB after the 2009 season, former Minnesota Twins setup man Julio DePaula became a closer for the 2010 Eagles, where manager Han Dae-Hwa intended to use Park as a left-handed specialist or long reliever.
Park had a surprising ERA of 1.65 and posted 5 scoreless holds in May and June, appearing in 22 games out of the bullpen.