Rank/Affiliation: Lieutenant, Special Division Team Leader, MIU General Team Leader / Special Division, MIU Experience: 7th year as Lieutenant, 7 years total experience Ability: Profiling (Analyzes and deduces differences between the crime scene and surrounding circumstances, acquiring numerous clues and physical evidence from the scene) Age/Gender: 30 / Female Titles: Lt. Sleepground, General Team Leader Characteristics: The only member among the MIU team and allies to graduate from a 4-year Police University. Close with Rather. Has a somewhat stiff and authoritative but friendly way of speaking. Firm yet warm-hearted, responsible, and leads the unruly group.

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

Rank/Subordinate: Lieutenant, Investigation Team 3 Leader / Shin Seung-ah Experience: 3rd year as Lieutenant, 10 years total experience Affiliation: Investigation Team 3, MIU Age/Gender: 35 / Male Title/Ability: Lt. Soohyun / Eloquent Speaker Characteristics: Heugak's junior. Generous and mild-mannered. He speaks with a smile to both perpetrators and victims, but his eyes always turn cold when dealing with criminals. Uses an empathetic and persuasive tone; speaks with comfortable yet 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: 3rd year as Sergeant, 8 years total experience Affiliation: Violent Crimes Team 2, MIU Age/Gender: 29 / Male Title/Ability: Sgt. Rather / Action Leader (Interaction with the physical environment and physical applications, as well as intimidation. Guesses information like physique based on physical knowledge; can briefly assess the state of a corpse) Characteristics: Close with Sleepground like a neighborhood brother and sister; calls her by rank officially and 'Noona' privately. Has exceptional physical abilities and mental strength like a cliché hot-blooded detective. Children are scared of him because of his intimidating looks. Carries a hammer named 'Justice'. Passionate and fiery personality; his fists often move faster than his words in emergencies, but he is a good person at heart.

Rank/Subordinate: Sergeant / Cpl. Ddotty Experience: 3rd year as Sergeant, 7 years total experience Affiliation: Detective Team 1, MIU Age/Gender: 29 / Male Title/Ability: Sgt. Coa / Encyclopedia (Not an electronic dictionary concept, but a type of hyperthymesia that recalls information seen somewhere before) Characteristics: Deokgae's mentor. Playful and very sociable. Excellent at handling situations on the fly. 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 Characteristics: Contrary to her cautious and delicate personality, she has a strong sense of justice. Seems to have a wide network for gathering information, as her independent sources and information networks are quite impressive. 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 Family: Wife, Kwon Jae-eun (Daughter, 5 years old) Characteristics: As a violent crimes detective, he possesses strong physical abilities and shows a personality that values personal philosophy on justice, responsibility, and honor. Has a strong proactive tendency. Contrary to his intimidating appearance, he is a devoted husband and a doting father.

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

Age/Gender: 36 / Male Rank/Title: Detective Team 2 Leader / Lt. Oh Affiliation: Detective Team 2, MIU Supporting Ally Subordinate: Deokgae Characteristics: Has a gentle and calm personality. Excellent at intuiting information or evidence that might be helpful.