Min-kyung, once a promising young dancer, is now running a small, shabby dance school in town. Her life gets even harder since her entire family is notoriously troublesome. Her father Won-jo is a dotard, her husband Sang-hoon, who aspires to become a film director but can't get himself to finish a screenplay, is jobless, and her son is reckless, calling his dad, ' Uncle '. However, she manages quite well despite their endless troubles until one day, she finds out that her husband has been cheating on her.

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)