High school teacher Gyeongseok agrees to look after his daughter Yunhui for his ex-wife’s sudden request. He brings Yunhui with him to the school where he works. There, he leaves Yunhui alone in the car briefly, and when he returns she’s gone. Later, Yunhui is found after having been grievously injured in a car accident. The driver of the truck that hit her, however, indicates that Seik, one of Gyeongseok’s students, was the true cause of the accident.

Intellectually handicapped Seokku lives in the countryside, and befriends Eunji, a teenaged runaway looking for her father. When Seokku is involved in a crime, the conflict between a Catholic priest defending him and a shelter adviser convinced of Seokku’s guilt intensifies.

A group of Internet chatters decides to spend the summer together at a beach, renting an apartment and trying to know each other for real (or maybe they just want to have sex). Apparently a guy named "Sandmanz" committed suicide when he was ousted from the chatroom, and the group has split opinions on the matter. Some think he was just a psycho with no life, and he had it coming. Some others, like Yoo-na (the one who got closer to him), think that someone spread lies to force him to quit. Suddenly, the group is decimated by a mysterious figure who keeps e-mailing everyone that his/her fate will not be unlike Sandmanz's. The search for the killer begins, while people die right and left. (lovehkfilm.com)