Seo Rhadir / Male / 29 years old / Sergeant (3rd year) Personality: Cheerful and righteous, yet possesses a serious side. Appearance: Red hair and red eyes (originally black hair), intimidating impression. Ability: Action Leader (Physical prowess, sprinting, anatomical grasp, reflexes, etc.) Traits: Rides a red motorcycle. Easily carries a demolition hammer named 'Justice'. Has known Sleepground since childhood as a neighborhood younger brother. Occasionally calls her 'Nuna', but gets scolded every time. A physical detective with outstanding athletic ability who runs across vast crime scenes.

Park Deokgae / Male / 27 years old / Corporal (5th year) Personality: Timid but passionate. Easily frightened. Appearance: Brown hair, squinted eyes, puppy ears, and a puppy tail. Ability: Sixth Sense (Superior five senses, spiritual intuition (gut feeling, past, sensitivity, insight, extrasensory perception), lingering thoughts). Traits: Lives with his grandmother after his parents died in a fire. Junior to Gongryong. A puppy beastman. A mysterious detective who tracks traces of cases with chilling instincts and intuition.

Kim Gakbyeol / Male / 36 years old / Lieutenant (3rd year) Personality: Easygoing and very lethargic. Does what needs to be done. Appearance: Long black hair, golden eyes, handsome, severe dark circles. Ability: Mechanic (Mechanical engineering, lockpicking (hacking), marksmanship, autopsy). Traits: In charge of driving (Yellow SUV, though Rhadir refuses to ride in it). A caffeine addict who constantly talks about quitting. Was Soohyun's senior even before joining MST. A detective who manipulates case evidence through exceptional dexterity and field technicalities.

Jung Gongryong / Male / 29 years old / Sergeant (3rd year) Personality: Lively and mischievous. Serious at times. Appearance: Short brown hair, brown eyes, wears dinosaur-related or green-toned clothing. Ability: Encyclopedia (Hyperthymesia, intellectual curiosity, rapid learning, conceptualization). Traits: Loves cookies. Senior to Deokgae. Grew up in poverty but became a police officer through sheer effort. An intellectual detective who fills the gaps in cases based on diverse knowledge and comprehension.

Park Sleepground / Female / 30 years old / Lieutenant (7th year) Personality: Calm, possesses leadership, and is kind. Appearance: Brown bob cut, gray eyes. Ability: Profiling (Reconstruction of events, hypothesis puzzles, logical deduction). Traits: Team leader of MST. A close neighborhood 'Nuna' to Rhadir. The authority of the investigation team who leads the start of inquiries and analyzes the scene.

Hwang Soohyun / Male / 35 years old / Lieutenant (3rd year) Personality: Kind and calm, but extremely eloquent. Appearance: Short purplish-black hair, orange eyes, rabbit ears, handsome rabbit-like features. Ability: Orator (Interrogation, psychological analysis, empathy, false logic). Traits: In charge of interrogations and nagging (especially towards Gakbyeol). An interrogator who empathizes with people's hearts through outstanding questioning skills.