New Zealand came out firing and within three minutes were 1-0 up after Hugo Inglis finished off a strong attacking move involving Ryan Archibald and Simon Child.
Inglis added a second 10 minutes later after a goalmouth scramble.
Korea were awarded a penalty corner after 22 minutes and Nam Yong Lee converted the opportunity to take the score to 2-1.
Some strong goalkeeping from Stephen Graham denied the Koreans adding to that score in the first spell but a second-half hat-trick from Lee, including two penalty corner goals, put them in control.
Nick Wilson, in his 100th test for the Black Sticks, missed the opportunity to claw one back with about five minutes to go, shooting high over the net.
RESULTS
Full time: 4-2 (Korea win)
Half time: 2-1(New Zealand lead)
New Zealand goalscorers: Hugo Inglis 2