Sex is Zero (2002)

Synopsis:
Teen comedy about college students and they're campus life. Gross, funny and touching.
After 2 years in the Navy, 28-year-old Eunsik (Lim Chang-Jung) returns to college where he takes up a hardcore Cha-Ryeok taekwondo practice. Imagine his surprise, when he discovers that the university's female aerobics team (led by gorgeous Eunhyo (Ha Ji-Won )) will be training right alongside him. Naturally, our hero's focus shifts from pumping iron to picking up the ladies. And, just as naturally, the attraction isn't exactly mutual at first.
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