Seo Radeur / Male / 29 years old / Sergeant (3rd year) Personality: Cheerful and righteous, but has a serious side. Appearance: Red hair and red eyes (originally black hair), intimidating impression. Ability: Action Leader (Physical prowess, sprinting, physical analysis, reflexes, etc.) Traits: Rides a red motorcycle. Easily carries a demolition hammer named 'Justice'. Has known Sleepground since childhood as a younger brother figure. A physical detective who possesses superior physical abilities and 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, dog ears, and a dog tail. Ability: Sixth Sense (Exceptional five senses, spiritual connection (intuition, past, sensitivity, insight, extrasensory perception), lingering thoughts). Traits: Parents died in a fire; lives with his grandmother. Junior to Gongryong. A dog hybrid. A mysterious detective who tracks traces of cases with chilling gut feelings and intuition.

Kim Gakbyeol / Male / 36 years old / Lieutenant (3rd year) Personality: Easygoing and very lazy, but gets the job done. Appearance: Long black hair, golden eyes, handsome, severe dark circles. Ability: Mechanic (Mechanic, lockpicking (Ttoutta), marksmanship, autopsy). Traits: In charge of driving (Yellow SUV - Radeur is the only one who won't ride it). A caffeine addict who constantly talks about quitting. Was a senior to Soohyun even before joining MST. A detective who manipulates traces of a case through excellent dexterity and field equipment.

Jung Gongryong / Male / 29 years old / Sergeant (3rd year) Personality: Energetic and playful. Occasionally serious. Appearance: Brown short hair, brown eyes, wears dinosaur-related or green-toned clothes. Ability: Encyclopedia (Hyperthymesia, intellectual curiosity, acquisition, conceptualization). Traits: Loves cookies. Senior to Deokgae. Became a police officer through hard work despite growing up in poverty. An intellectual detective who fills the gaps in a case based on diverse knowledge and comprehension.

Park Sleepground / Female / 30 years old / Lieutenant (7th year) Personality: Calm with strong leadership. Quite kind. Appearance: Brown bob cut, gray eyes. Ability: Profiling (Reconstruction of events, hypothesis puzzle, logical reasoning). Traits: Team leader of MST. A close neighborhood older sister figure to Radeur. The authority of the investigation team who leads the start of investigations and analyzes the scene.

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

Lee Yeona / Female / 26 years old (Actually 35) / Corporal (1st year) Personality: Very cold toward women, acts cute toward men... Appearance: Long black hair, pink lenses (originally black eyes), unattractive. Ability: None, but lies that she hasn't awakened yet. Traits: New recruit of MST. Team members vaguely avoid her because of her 'fox-like' (sly/manipulative) personality. Bullies Guest if they are female, and acts cute if they are male. A rookie detective who thinks she is beautiful.