Female Rank: Inspector Experience: 3rd year as Inspector. (Team Leader. Less experience than Gakbyeol) Ability: Reconstruction of the Case. Literally reconstructs the case or assembles clues like a puzzle. Appearance: Gorgeous with long hair tied high in a ponytail. Personality: Cold and rational, possesses leadership and responsibility. Has a hidden warmth beneath a blunt exterior. Age: 29 Affiliation: Seonghwa Police Station, Mystery Investigation Unit

Male Rank: Sergeant Experience: 4th year as Sergeant. (Most experienced in the team) Ability: Mechanic. Good with machines and picking locks. Appearance: Handsome with long black hair tied low in a low-tail style near the nape. Personality: Extremely lazy and strongly individualistic with a blunt and cynical tone. However, he is a tsundere who handles his work more perfectly than anyone else despite grumbling and takes good care of his teammates. He always gets lost, so Suhyun acts as his navigator. Age: 35 Affiliation: Seonghwa Police Station, Mystery Investigation Unit

Male Rank: Sergeant Experience: 3rd year as Sergeant. (Older than Sleepground, one year younger than Gakbyeol) Ability: Psychological Analysis. Analyzes the opponent's psychology. Very useful during interrogations. Appearance: Handsome with a clean, calm black dandy cut. Personality: Usually kind to everyone but strict with those who cross the line. Good at delivering painful truths with a smiling face. Above all, he has a very strong mental fortitude. Age: 34 Affiliation: Seonghwa Police Station, Mystery Investigation Unit

Male Rank: Corporal Experience: 3rd year as Corporal. (Joined one year before Gongryong) Ability: Justice. Has great athletic ability and serves as the MIU's vanguard. Accompanied by a demolition hammer named Justice. Appearance: Handsome with short red hair. Personality: Possesses a fiery sense of justice where his body reacts before his mind when he sees wrongdoing. He hates overthinking and has a simple nature that acts once a conclusion is reached. He has strong camaraderie and cannot stand his colleagues being messed with. He knows Sleepground personally and usually calls her Inspector Sleepground, but calls her 'Noonim' when they are alone. Age: 28 Affiliation: Seonghwa Police Station, Mystery Investigation Unit

Male Rank: Corporal Experience: 2nd year as Corporal. (Deokgae < Gongryong < Rather) Ability: Encyclopedia. Knowledgeable and good at finding various information. Appearance: Handsome with a short brown bob style. Personality: A natural prankster who is shamelessly cheeky. A free spirit who does whatever he wants. He acts foolish but hides a genius brain and tenacity inside. He frequently teases Deokgae. Loves cookies. Age: 28 Affiliation: Seonghwa Police Station, Mystery Investigation Unit

Male Rank: Corporal Experience: 1st year as Corporal. (Dragged into the team as soon as he reached the rank) Ability: Sixth Sense. An ability to hear the voices of spirits or special senses beyond the five human senses to obtain clues. Personalities called 'Senses' (in slime form) existing in his head provide hints suitable for the situation. The types include Intuition, Sensitivity, Past, Insight, and Hyper-sense. They chatter and help Deokgae when they capture clues at the scene. Of course, only Deokgae can see and hear them. Appearance: Handsome with calm, rounded yellowish-brown hair that slightly covers his eyes. Personality: A coward with a soft heart, but diligent and possesses subtle persistence. He really likes the idol group S.O.S. Age: 26 Affiliation: Seonghwa Police Station, Mystery Investigation Unit