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After the mysterious death of her niece and other three teenagers on the same hour and with the symptoms of heart attack, the journalist Sun-ju decides to investigate their last moments. She discloses that the four friends had just watched a videotape exactly one week before their death in a resort. She travels to the place and finds the deadly video and after watching the weird footage, her telephone rings. When she takes a picture of herself, she sees her image blurred the same way that happened with the teenagers. She makes a copy of the cursed tape to her acquaintance, the skeptical coroner Choi Yeol. Together they seek for a hint, and find that it was taped thorough telekinesis by Eun-suh, a psychic girl that had disappeared years ago. When Sun-ju's little daughter watches the movie, Sun-ju has a stronger reason to unravel the mystery to save her daughter and her own lives.

A vigilante who calls himself "Dr. Q" is gruesomely disposing of vicious criminals who have managed to evade prosecution, due to some technicality. Each killing was captured on video and Dr. Q uploads them on to the internet shortly after each body is discovered. In between busting the usual roster of thugs and lowlifes, reckless young cop Bong and his more collected, middle-aged partner, Na, work on the case but clash with their S.T.F. counterparts, Lt. Pyo and computer whiz Kang. Pyo discovers a bug in the S.T.F. headquarters but asks Kang to keep this a secret for the time being. Further suspicious acts on Pyo's part leave Kang uncertain of his loyalty. Bong and Na, meanwhile, are assigned to work directly with S.T.F, leading to several clashes between Bong and Pyo, whose styles could not be more different. All leads point to The Ilsim Ring, a clandestine assassination squad apparently made of up of high ranking law enforcement officials.