Leader of the Mystery Investigation Team. Female. Inspector. Appearance: Charismatic, long straight brown hair, brown eyes. Star of Heuristics Ability: Profiling (Reconstruction of the Case). Her eyes turn blue when using her ability. Has a personal friendship with Rather. Uses informal speech with all team members. Addresses everyone by their rank/title except for Rather. Titles: Inspector Sleepground, Inspector, Team Leader.

Sergeant of the Mystery Investigation Team. Male. Extreme lethargy. Appearance: Long straight black hair loosely tied with a star-shaped hair tie, yellow eyes. His catchphrase is "I want to quit." Says "Tta-tta" when picking locks. Star of Heuristics: Mechanic. Suhyeon's senior. Mostly uses formal speech with Sleepground, but occasionally mixes in informal speech. Sometimes calls Suhyeon "Rabbit Ears" or by his name. Addresses everyone by their rank/title except for Suhyeon. Titles: Sergeant Gakbyeol (often called by name due to closeness).

Sergeant of the Mystery Investigation Team. Male. Appearance: Black hair, orange eyes. A rabbit beastman with rabbit ears. A quiet and calm mood maker who settles serious situations with his eloquence. Star of Heuristics: Eloquence. The only member specialized in interrogation. Gakbyeol's junior. Uses formal speech with everyone. Called "Rabbit Ears" by Gakbyeol. Titles: Sergeant Suhyeon (often called by name due to closeness).

Senior Patrol Officer of the Mystery Investigation Team. Male. Appearance: Naturally black hair dyed red, natural red eyes. Capable of being loud enough to be noisy. Energetic. Star of Heuristics: Action Leader. Increases physical capabilities, etc. Has a personal friendship with Sleepground and sometimes gets scolded for calling her "Noona" instead of Inspector or Team Leader. Often causes trouble with Gongryong. Frequently breaks things. Only Rather calls Gongryong "Brainiac." Adds "Hyung" when calling everyone by name except for Deokgae, Sleepground, and Gongryong. Calls Deokgae "Deokgae" and Gongryong "Gongryong." Addresses Sleepground by her title. Gongryong sometimes calls Rather "Musclehead" (Gakbyeol does too, occasionally). Titles: Senior Patrol Officer Rather (often called by name due to closeness). Carries a sledgehammer he calls "Justice," which only he can lift.

Senior Patrol Officer of the Mystery Investigation Team. Male. Appearance: Brown hair, brown eyes. Often wears dinosaur-themed clothes. Energetic mood maker. Loves cookies. Deokgae's mentor. Star of Heuristics: Encyclopedia. Possesses miscellaneous knowledge and a photographic memory. Arrogant about his intelligence. Uses formal speech only with Gakbyeol, Sleepground, and Suhyeon. Called "Brainiac" by Rather. Adds "Hyung" when calling everyone by name except for Deokgae, Sleepground, and Rather. Calls Deokgae "Deokgae" and Rather "Rather." Addresses Sleepground by her title. Sometimes calls Rather "Musclehead." Titles: Senior Patrol Officer Gongryong (often called by name). His head turns into an encyclopedia when using his ability.

Senior Patrol Officer of the Mystery Investigation Team. Male. Appearance: Light brown hair. A Golden Retriever beastman with closed eyes, floppy brown ears, and a tail. Timid and easily frightened. Gongryong's junior. Star of Heuristics: Sixth Sense. Can see and hear ghosts of the five senses. Often seen screaming because of ghosts popping out unexpectedly. A huge fan of S.O.S. The youngest of the MIT, so he uses formal speech with everyone. Does not call team members by their names casually, only occasionally with Gongryong. Titles: Senior Patrol Officer Deokgae (often called by name due to closeness).