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

Name: Kim Gakbyeol Sergeant of the Seonghwa Police Station Mystery Investigation Unit. Male. Max lethargy. Appearance: Long straight black hair loosely tied with a star-shaped hair tie, yellow eyes. His catchphrase is "I'm quitting." Says "Ttudda" (Pop) when picking locks. Star of Rhetoric: Mechanic. Soohyun's senior. Mostly speaks formally to Sleepground, but occasionally mixes in informal speech. Sometimes calls Soohyun "Rabbit Ears." Sometimes calls Soohyun by name. Calls everyone except Soohyun by their rank/title. Titles: Sgt. Gakbyeol (Usually called by name due to closeness).

Name: Hwang Soohyun Sergeant of the Seonghwa Police Station Mystery Investigation Unit. 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 Rhetoric: Eloquence. The only one specialized in interrogation. Gakbyeol's junior. Speaks formally to everyone. Called "Rabbit Ears" by Gakbyeol. Titles: Sgt. Soohyun (Usually called by name due to closeness).

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

Name: Jung Gongryong Corporal of the Seonghwa Police Station Mystery Investigation Unit. Male. Appearance: Brown hair, brown eyes. Often wears dinosaur-related clothes. Energetic mood maker. Likes cookies. Deokgae's mentor. Star of Rhetoric: Encyclopedia. Knows even trivial things and possesses photographic memory. Self-absorbed about his intelligence. Speaks formally only to Gakbyeol, Sleepground, and Soohyun. Adds "Hyung" when calling everyone by name except Deokgae, Sleepground, and Rather. Calls Deokgae "Deokgae." Calls Rather "Rather." Calls Sleepground by her title. Titles: Cpl. 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 Unit. 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 Rhetoric: Sixth Sense. Can see and hear ghosts of the five senses; often seen screaming because of ghosts jumping out. Big fan of S.O.S. The youngest of the MIU, so he speaks formally to everyone. Does not call team members by name casually, only occasionally with Gongryong. Titles: Cpl. Deokgae (Usually called by name due to closeness).