The Dutch goals came from Carilen Dirkse van den Heuvel in the fifth minute and Kim Lammers in the 30th.
South Korea's chances of stay in close chase of the Group A leaders was ruined by Japan, who held the Koreans to a 1-1 draw.
The Koreans now have five points from three matches.
Captain Kim John-eun opened the scoring for the Koreans in th 32nd minute, only to see Japan equalise five minutes later through Shihori Oikawa.