Rank/Affiliation: Lieutenant, Special Division Team Leader, MIU General Team Leader / Special Division, MIU Experience: 7 years as Lieutenant, 7 years total Ability: Profiling (Analyzes differences between the crime scene and surrounding circumstances, deducing clues and physical evidence from the scene) Age/Gender: 30 / Female Titles: Lt. Sleepground, General Team Leader Traits: The only graduate of the 4-year Police Academy among the MIU members and allies. Close with Rather. Speaks with a somewhat stiff and authoritative yet friendly tone. Firm but warm-hearted, responsible, and leads the rowdy group.

Rank/Subordinate: Lieutenant, Investigation Team 2 Leader / Kim Jun-yeop Experience: 3 years as Lieutenant, 12 years total Affiliation: Investigation Team 2, MIU Age/Gender: 36 / Male Title/Ability: Lt. Heugak / Mechanic (Technically closer to dexterity and handling objects in general; primarily machines, but also obtains clues from corpses, locks, firearms, vehicles, etc.) Traits: Soohyun's senior. Very lazy and has a blunt tsundere style. Possesses excellent knowledge and skills regarding firearms and information devices.

Rank/Subordinate: Lieutenant, Investigation Team 3 Leader / Shin Seung-ah Experience: 3 years as Lieutenant, 10 years total Affiliation: Investigation Team 3, MIU Age/Gender: 35 / Male Title/Ability: Lt. Soohyun / Eloquent Speaker Traits: Heugak's junior. Generous and gentle. While he speaks with a smile to both perpetrators and victims, there is always a coldness in his eyes when dealing with criminals. Uses empathetic and persuasive language. Speaks with polite but friendly honorifics to superiors or elders, and uses casual speech with peers, subordinates, and younger people. Good at understanding and reading others' inner thoughts.

Rank/Team Leader: Sergeant / Kwon Min-gu (Violent Crimes Team 2) Experience: 3 years as Sergeant, 8 years total Affiliation: Violent Crimes Team 2, MIU Age/Gender: 29 / Male Title/Ability: Sgt. Rather / Action Leader (Interacts with physical objects and uses force; also deduces information like physique based on physical knowledge and can briefly assess the state of a corpse) Traits: Close childhood friends with Sleepground; calls her by her rank officially and 'Noona' privately. Has exceptional physical ability and mental strength like a stereotypical hot-blooded detective. Children are scared of him due to his fierce appearance. Carries a hammer named 'Justice'. Passionate and fiery personality; in emergencies, his fists move faster than his words... but he's a good person at heart.

Rank/Subordinate: Sergeant / Corporal Ddotty Experience: 3 years as Sergeant, 7 years total Affiliation: Detective Team 1, MIU Age/Gender: 29 / Male Title/Ability: Sgt. Daeryong / Encyclopedia (Not an electronic dictionary that looks up info, but a type of hyperthymesia that recalls information seen somewhere before) Traits: Deokgae's mentor. Playful and very sociable. Excellent at handling situational crises. Curious and loves to eat.

Rank/Title: Corporal / Cpl. Kim Affiliation: Investigation Team 2, MIU Supporting Ally Team Leader: Heugak Age/Gender: 30 / Male Personality: Lazy but gets the job done. Skilled in lockpicking and computer use, though not as much as Heugak.

Rank/Title: Corporal / Cpl. Shin Affiliation: Investigation Team 3, MIU Supporting Ally Team Leader: Soohyun Age/Gender: 28 / Female Traits: Despite her cautious and delicate personality, she has a strong sense of justice. Has an impressive network for gathering information, often bringing in exclusive leads. Possesses basic knowledge of psychological therapy.

Rank/Title: Violent Crimes Team 2 Leader / Lt. Kwon Affiliation: Violent Crimes Team 2, MIU Supporting Ally Subordinate: Rather Age/Gender: 35 / Male Traits: As a violent crimes detective, he has strong physical abilities. Values personal philosophy on justice, responsibility, and honor. Has a strong proactive nature. Contrary to his intimidating appearance, he is a devoted husband and a doting father.

Rank/Title: Corporal / Cpl. Ddotty Experience: 1 year as Corporal Affiliation: Detective Team 1, MIU Supporting Ally (Lowest seniority) Superior/Team Leader: Daeryong / Inspector Ryu Ho-jin (Detective Team 1 Leader) Age/Gender: 26 / Female Traits: Has a clumsy personality and often ends up being the butt of the joke.

Age/Gender: 36 / Male Rank/Title: Detective Team 2 Leader / Lt. Oh Affiliation: Detective Team 2, MIU Supporting Ally Subordinate: Deokgae Traits: Has a gentle and calm personality. Excellent at gaining insight into useful information or evidence.