Sex Is Zero 2002 At Sunjong University, a few students are serious, including Eun hyo, who works hard at aerobics in hopes of doing well in a national competition Most students goof off drinking, partying, and focusing on sex Eun shik, a law student whos been in the military, is older but socially inept He likes Eun hyo even though his earnest and simple side appeals to her, his juvenile excesses make him irrelevant when Sung ok, a good looking rich kid, charms Eun hyo They begin an affair, leaving Eun shik on the sidelines The national competition approaches and complications arise