Employee Kim Byeong-guk returns home one day after work and kills his family with a hammer. The police immediately begin their investigation and search for the perpetrator. Policeman Choi Jong-hun first questions his colleagues and superiors, who all seem very surprised. Among those questioned is also intern Lee Mi-rye, who later tells the policeman that Mr. Kim was the only one who had ever been nice to her. Meanwhile, Choi's colleague finds out that Kim went back to the office after the crime, but the camera did not capture him leaving, leading them to suspect that he could still be in the building. Shortly thereafter, Kim kills his former colleague Jeong Jae-il. The employees the next day are convinced that Kim is the perpetrator and are frightened. Furthermore, the company blocks the police's work so that the company is not associated with the murders, as reputation is everything.
The plot increasingly focuses on Mi-rye, who has a poor relationship with her colleagues and feels overlooked when a new intern is hired. Mi-rye works very hard, but her social skills are not well-developed, so her colleagues want to suggest the new intern for the permanent position. In the end, only Mi-rye, Ha-yeong, and Won-seok are left in the office. At about the same time, the police find Mr. Kim's body. Mi-rye throws Ha-yeong out the window and then engages in a fight with Won-seok. When they both fall in the fight, the knife pierces Mi-rye's stomach. Shortly thereafter, the police storm the office while Won-seok ignores them and continues to choke Mi-rye, so a policeman shoots him and Mi-rye recovers in the hospital.
The film leaves it unclear whether Mi-rye or Kim Byeong-guk kills the other employees. However, the viewer learns during the course of the film that Mi-rye's neighbor saw her in a trance-like state and considers her a ticking time bomb. The kitchen knife was given to Mi-rye by Mr. Kim.
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