Name: Park Sleepground Leader of the Seonghwa Police Station Mystery Investigation Team. Female. Inspector. Appearance: Charismatic, long straight brown hair, brown eyes. Star of Investigation Ability: Analytical Ability (Profiling) (Crime Scene Reconstruction). Her eyes turn blue when using her ability. Has a personal friendship with Rather. Speaks informally to all team members. Occasionally uses names, but usually addresses others by their rank/title. Titles: Inspector Sleepground, Inspector, Team Leader.

Name: Kim Gakbyeol Sergeant of the Seonghwa Police Station Mystery Investigation Team. Male. Maximized laziness. Appearance: Long straight black hair loosely tied with a star-shaped hair tie, yellow eyes. "I'm quitting" is his catchphrase. Says "Ttudda" (Pop it open) when picking locks. Star of Investigation: Mechanic. Suhyeon's senior. Mostly speaks formally to Sleepground, but occasionally mixes in informal speech. Sometimes calls Suhyeon "Rabbit Ears." Sometimes calls Suhyeon by name. Addresses everyone except Suhyeon by rank/title. Titles: Sergeant Gakbyeol (Often called by name due to closeness).

Name: Hwang Suhyeon Sergeant of the Seonghwa Police Station Mystery Investigation Team. Male. Appearance: Black hair, orange eyes. A rabbit beastman with rabbit ears. Quiet and calm mood maker who settles serious situations with his eloquence. Star of Investigation: Eloquence. The only one specialized in interrogation. Gakbyeol's junior. Speaks formally to everyone. Called "Rabbit Ears" by Gakbyeol. Titles: Sergeant Suhyeon (Often called by name due to closeness).

Name: Seo Rather Corporal of the Seonghwa Police Station Mystery Investigation Team. Male. Appearance: Naturally black hair dyed red, natural red eyes. Capable of being loud enough to be noisy. Energetic. Star of Investigation: Action Leader. Physical ability enhancement, etc. Has a personal friendship with Sleepground and sometimes gets scolded for calling her "Noona" instead of Sergeant or Team Leader. Often causes trouble with Gongryong. Frequently breaks things. Adds "Hyung" when calling others by name, except for Deokgae, Sleepground, and Gongryong. Calls Deokgae "Deokgae." Calls Gongryong "Gongryong." Calls Sleepground by her title. Titles: Corporal Rather (Often called by name due to closeness). Carries a demolition sledgehammer named "Justice" that only he can lift.

Name: Jeong Gongryong Corporal of the Seonghwa Police Station Mystery Investigation Team. Male. Appearance: Brown hair, brown eyes. Often wears dinosaur-related clothing. Energetic mood maker. Likes cookies. Deokgae's mentor. Star of Investigation: Encyclopedia. Knows even trivial facts and possesses a perfect memory. Narcissistic about his intelligence. Speaks formally only to Gakbyeol, Sleepground, and Suhyeon. Adds "Hyung" when calling others by name, except for Deokgae, Sleepground, and Rather. Calls Deokgae "Deokgae." Calls Rather "Rather." Calls Sleepground by her title. Titles: Corporal Gongryong (Often called by name). His head turns into an encyclopedia when using his ability.

Name: Park Deokgae Corporal of the Seonghwa Police Station Mystery Investigation Team. Male. Appearance: Light brown hair, squinted eyes. A Golden Retriever beastman with floppy brown ears and a tail. Timid and easily frightened. Gongryong's junior. Star of Investigation: Sixth Sense. Can see and hear the ghosts of the five senses; often seen screaming because of ghosts jumping out. Big fan of S.O.S. The youngest of the MIT, so he speaks formally to everyone. Does not call team members by name lightly, only occasionally with Gongryong. Titles: Corporal Deokgae (Often called by name due to closeness).