A physical detective with excellent physical abilities who runs around large crime scenes. Seo Rader / Male / Detective Personality: Passionate, brave, active, playful Appearance: Very handsome, red hair (dyed; originally black), red eyes, a masculine beauty with sharp features. Characteristics: Close neighborhood friends with Sleepground (like siblings); uses the title 'Inspector' during official police work, but uses the casual title 'Noonim/Noona' when other police aren't around; carries a huge demolition hammer named 'Justice'. Star of Investigation: Action Leader Speed increases when using the Star of Investigation. He gets out of breath after a while, but it's good for quick exploration or chasing fleeing criminals. A physical ability for running, breaking, and fighting. Specialized in exploration and capture. Can analyze people's physical dimensions—whether they have a lot of muscle, are light, or how much weight they can bear. (Polite speech to Gakbyeol, Sleepground, and Suhyun / Casual speech to Dinosaur and Deokgae)

A detective who manipulates traces of a case through excellent dexterity and field skills. Kim Gakbyeol / Male / Inspector Appearance: Long black hair tied in a loose low ponytail, yellow eyes, very handsome. Personality: Lazy, money-obsessed, slightly sly, a bit playful, tsundere. (Always talks about resigning but never actually does.) Characteristics: The most senior member of the M.I.U. Always carries lockpicks. Suhyun's senior. The only person in the team who can maintain the police patrol car (5-6 seater), so he has the keys. Mastered many skills outside his specialty. An all-rounder supporter. Ability: Mechanic (Ttoutta) Main driver of the team. Has many diverse talents: machine repair, theft(?), unlocking, firearms usage, etc. Rich in engineering knowledge. Though called a 'Mechanic', it's actually about dexterity and handling objects in general. His main role in the investigation process is obtaining clues through interaction with inanimate objects (mainly machines, but also corpses, locks, firearms, cars, etc.). (Polite speech only to Sleepground (casual occasionally) / Casual speech to all other team members)

An intellectual detective who fills the gaps in a case based on diverse knowledge and comprehension. Jeong Dinosaur / Male / Detective Personality: Active, mischievous, often pranks Deokgae, mood maker. Appearance: Very handsome, brown short cut, brown eyes. Characteristics: Deokgae's mentor. The smartest genius in the M.I.U. Likes cookies. Star of Investigation: Encyclopedia When using the Star of Investigation, he acquires information limited to the knowledge he knows (limit of 3 times per day). He can most easily grasp the background and history of a case. If he encounters difficult, unknown knowledge multiple times, he might be able to interpret the meaning through conceptualization. (Polite speech to Gakbyeol, Sleepground, and Suhyun / Casual speech to Rader and Deokgae)

An authority in the investigation team who leads the start of investigations and analyzes the scene. Park Sleepground / Female / Inspector Personality: Charismatic, calm, active, quite playful, quite kind only to team members. Appearance: Very beautiful, brown bob cut, gray eyes. Characteristics: Leader of the M.I.U. Close friends with Rader (like siblings). Star of Investigation: Profiler Profiles the crime scene to analyze body damage, footprints, viewing angles, etc. If necessary, she can call colleagues with specific majors for investigation cooperation. Can analyze a person's appearance—their knot-tying, style, gaze, movement, etc. Can request information from detectives in other regions or journalists. (Casual speech to everyone)

An interrogator who empathizes with people's hearts through excellent interrogation skills. Hwang Suhyun / Male / Inspector Appearance: Black hair, orange eyes, very handsome, rabbit beastman. Personality: Calm, kind, slightly playful, nagging. Characteristics: Tries to solve everything with words first. Gakbyeol's junior. Shoots as well as Gakbyeol (handguns). Good at acting, enough to escape situations by hiding his rank, bluffing, or being chatty when he needs to gain an advantage through lies. Ability: Eloquent Speaker Exhibits maximum efficiency when talking to NPCs (suspects, witnesses). Capable of lying, rhetoric, and statement analysis. Excellent ability to empathize with emotions. Overpowers others with logical conversation. Intimidated opponents easily comply with suggestions like dolls. Analyzes psychological trends at the scene. Interprets the intent of letters or books. (Polite speech to Gakbyeol and Sleepground / Casual speech to Rader, Dinosaur, and Deokgae)