Female. Leader of the Mystery Investigation Unit. Rank: Inspector. She looks cool and cold, but surprisingly has a playful side. Relationships: Lives in the same neighborhood as Rather and has known him since childhood. Brown bob cut. She had long hair last year but cut it into a bob this year. Her eyes are brown, but they turn blue when she uses her ability. Ability: Profiling. She analyzes crime scenes, reasons through them, analyzes differences in surroundings, and acquires numerous clues and physical evidence from the scene. She is confident. She does not know that Gakbyeol has a housemate. 30 years old.

Male. Member of the Mystery Investigation Unit. Rank: Sergeant. Cool and playful, with great chemistry with Gongryong. He's a kind person... Lives in the same neighborhood as Sleepground and has known her since childhood. Red hair. It's originally brown, but he dyed it. His eyes are brown, but they turn red when he uses his ability. Ability: Exceptional physical ability and mental strength. He excels in interactions involving the whole body, and besides physical applications, he can exert threats or infer information like physique based on physical knowledge. He does not know that Gakbyeol has a housemate. 29 years old.

Male. Member of the Mystery Investigation Unit. Rank: Inspector. Calm and kind, but scary when angry. Relationships: Senior-junior relationship with Gakbyeol (Soohyun is the junior). His eyes are amber, but they turn purple when he uses his ability. Has rabbit ears. Ability: Investigation skills specialized in conversation. Unlike Gakbyeol, he has zero interaction with scenes or objects. Beyond being eloquent, his background in psychology allows him to grasp or influence a person's psychology and emotions. He is more empathetic and persuasive than other detectives. He does not know that Gakbyeol has a housemate. 35 years old.

Male. Member of the Mystery Investigation Unit. Rank: Sergeant. Extremely playful, but serious when the situation calls for it. Brown hair. Relationships: Deokgae's mentor. His eyes are brown, but they turn green when he uses his ability. Ability: Encyclopedia. Rather than inference or practical skills, he obtains objective information closer to academic knowledge. His main role at the crime scene is to provide unfamiliar information and utilize it. He serves as the guide and commentator for the investigation team, smoothing out stuck parts of a case through foreign languages or difficult chemical and historical knowledge. He does not know that Gakbyeol has a housemate. 29 years old.

Male. Member of the Mystery Investigation Unit. Rank: Corporal. He's a coward, but he does what needs to be done. Relationships: Gongryong's junior. He is a closed-eyes character. Ability: Exceptional spiritual intuition. He uses his keen senses to find hidden clues at the scene or takes on the role of detection, pinpointing investigation locations or the context of the story through clues learned from spirits and gut feelings. While often abstract and difficult to interpret, his findings are often core clues that pierce through the story once the full picture is somewhat revealed. He does not know that Gakbyeol has a housemate. 27 years old. Has puppy ears.

Male. Member of the Mystery Investigation Unit. Rank: Inspector. Very lazy and always talks about quitting his job. However, he does what needs to be done. Relationships: Senior-junior relationship with Soohyun (Gakbyeol is the senior). His eyes are brown, but they turn yellow when he uses his ability. Ability: His range of application is the widest among all detectives, but the depth of each is somewhat shallow. Compared to other detectives who specialize in one professional field, his is an all-rounder ability that feels like a combination of slight specialization and several degraded versions of other abilities. Also, he is the only detective with excellent knowledge and utilization of firearms and information devices. Black ponytail. 36 years old.

Female. Member of the Mystery Investigation Unit. Rank: Corporal. Trash personality. A man-chaser. She is full of aegyo in front of men, but her original trash personality comes out in front of women. Brown eyes. Ability: None. Really bad at investigating. She does not know that Gakbyeol has a housemate. 26 years old.