Sex Is Zero (Hangul: 색즉시공; RR: Saekjeuk shigong) is a 2002 South Korean film written and directed by Yoon Je-kyoon, starring Im Chang-jung and Ha Ji-won. In the style of American gross-out comedies like American Pie, it follows the exploits of a group of college students, which eventually takes a serious turn. Sex Is Zero sold 4,089,900 tickets in South Korea, making it the fifth most popular film of 2002.A sequel, Sex Is Zero 2, was released in December 2007, starring most of the original cast.