When one accidental killing leads to another, an ordinary young man finds himself stuck in an endless cat-and-mouse chase with a shrewd detective.

Lee Tang (Choi Woo-Sik) is an ordinary university student. While he works his part-time job at a convenience store, he gets into a fight with a rude drunk man and accidentally kills him. He is terrified that he killed a person and his life could be ruined. It turns out the dead man is a serial killer and he has been wanted for the past 4 years. Lee Tang realizes that he has a special ability to recognize bad people who deserve to die. Lee Tang soon becomes a serial murderer to kill these evil people. Detective Jang Nan-Gam (Son Suk-Ku) investigates a murder case committed by Lee Tang. His instincts as a detective leads him to suspect Lee Tang as the killer. Meanwhile, Song Chon (Lee Hee-Jun) is an ex-detective who chase after Lee Tang alone.—AsianWiki