"Sex Is Zero" is a South Korean romantic comedy film released in 2002. The movie tells the story of two young men, Eun-Su (played by Cha Tae-hyun) and Dong-Guk (played by Jung Jae-young), who get caught up in a series of misadventures as they try to navigate their relationships with two women, Yeon-Jeong (played by Kim So-yeon) and Soo-Jin.