The trailer begins by establishing the dark and mysterious nature of the detectives' jobs through a conversation between the detectives. It then shows flashing images hinting at the high-level crimes and mystery they face. A metronome suggests the detectives have limited time to catch the killer who plans to carry out seven murders based on the seven deadly sins. The trailer provides glimpses of the gory murder scenes and clues left by the killer while also showing the toll the case takes on the detectives' personal lives. It builds suspense around catching this serial killer who commits murders according to the seven deadly sins before the experienced detective's retirement.