 When Sun-ae returns from the United States of America to Seul after two years of absence, her friend Hye-jin welcomes her at home. Sun-ae is disturbed and tells Hye-jin that the ghost of their deceased friend Kyung-ah is haunting and chasing her. Hye-jin recalls when she introduced her new friend Eun-ju to their former close college friends: She-hoon, who used to tape every moments with his camera; Hyun-joon, who was a promising baseball player before damaging his knee; Jung-wook, who has become a prominent lawyer; and Jung Mi-ryoung, who works in advertisement on television. The jealous and envious Sun-ae revealed a secret from the past of Eun-ju causing a tragedy in the group. When She-hoon, Hyun-joon and Mi-young are killed, Hye-jin finds a videotape hiding a dark covenant of her friends about the death of Kyung-ah.