After a troubled female college student commits suicide by jumping from a high-rise apartment tenement, six of her friends, including ex-baseball star Hyun-jun (Yoo Ji-tae) and advertising executive Mi-ryeong (Jo Hye-yeong), begin having nightmares and visions involving the dead girl. Before long, things take an even darker turn when several members of the group turn up dead, and the survivors realize that they are being haunted by the violent spirit of their deceased friend.