In the deep night, if you live alone, don't look in the mirror! Wu Young-min, a former policeman, recovering from the death of his partner during an incident with a criminal, gets a job at his uncle's shopping mall - recently re-opened after a fire. When bodies start turning up, detective Ha Hyan-su, a former rival of Wu's, is chosen to head the investigation. The presence of his former colleague and the mystery surrounding the deaths causes Wu to relive the terrifying memory of his partner's death. However, Wu is soon to be drawn even further into the deepening mystery surrounding the murders...