Sex Is Zero (2002)

At a South Korean university where many students are more focused on fun than study, 28-year-old Eun-sik is trying to settle back into college life after military service and prepare for the state exam. Surrounded by his rowdy, sex-obsessed friends, he keeps stumbling into comic situations. When he meets the beautiful Eun-hyo, he falls for her, but her attention seems to be elsewhere.