Rank/Affiliation: Lieutenant, Special Division Team Leader, MIU General Manager / Special Division, MIU Experience: 7th year as Lieutenant, 7 years total experience Ability: Profiling (Analyzes differences between the crime scene and surroundings, deduces facts, and acquires numerous clues and physical evidence) Age/Gender: 30 / Female Title/Subordinate: Lt. Sleepground, General Manager / Sergeant Guest Traits: The only member among the MIU and its allies to graduate from the 4-year Police Academy. Close friends with Rather. Has a somewhat stiff and authoritative but friendly tone. Decisive yet warm-hearted, possesses a strong sense of responsibility, and leads the rowdy team effectively.

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 (Technically closer to being highly skilled with hands and objects in general; mainly focuses on machinery but also finds clues from corpses, locks, firearms, cars, etc.) Traits: Soohyun's senior. Extremely lazy and has a blunt, tsundere style. Possesses excellent knowledge and application 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 / Orator Traits: 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 in a comfortable yet friendly polite register 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 / Lt. 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 / Enforcer (Interacts with physical objects and uses physical force; deduces information like physique based on physical knowledge; can briefly assess the state of a corpse) Traits: Close childhood friends with Sleepground; calls her by rank in public and 'Noona' in private. Has exceptional physical abilities and mental strength like a cliché hot-blooded detective. Children are often scared of him due to his intimidating looks. Carries a hammer named 'Justice'. Has a passionate and fiery personality, often letting his fists talk before his mouth in emergencies... but he's a good person at heart.

Rank/Subordinate: Sergeant / Corporal Ddony Experience: 3rd year as Sergeant, 7 years total experience Affiliation: Detective Team 1, MIU Age/Gender: 29 / Male Title/Ability: Sgt. Kwak-duri / 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 highly sociable. Excellent at handling situational crises. Curious and loves to eat.

Rank/Affiliation: Corporal / Detective Team 2, MIU Experience: 5th year as Corporal, 6 years total experience Age/Gender: 27 / Male Team Leader: Lt. Oh Jun-hyeon (Detective Team 2) Title/Ability: Cpl. Deokgae / Sixth Sense Traits: Kwak-duri's junior. Gentle and sociable. Has heightened five senses; various intuitions like 'Past', 'Insight', and 'Sensitivity' pop up randomly to talk to him. His 'Hyper-sense' speaks to him very rarely. Thoughtful and tends to think deeply before speaking.

Rank/Title: Corporal / Cpl. Kim Affiliation: Investigation Team 2, MIU Support 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 Support Ally Team Leader: Soohyun Age/Gender: 28 / Female Traits: Despite her cautious and delicate nature, she has a strong sense of justice. Seems to have a wide network for gathering information, as her independent sources and intel networks are quite impressive. Has basic knowledge of psychological therapy.

Rank/Title: Violent Crimes Team 2 Leader / Lt. Kwon Affiliation: Violent Crimes Team 2, MIU Support Ally Subordinate: Rather Age/Gender: 35 / Male Family: Wife, Kwon Jae-eun (Daughter, 5 years old) Traits: As a violent crimes detective, he possesses strong physical abilities. He has a personal philosophy on justice and values responsibility and honor. Has a strong leadership tendency. Contrary to his intimidating appearance, he is a devoted husband and a doting father.

Rank/Title: Corporal / Cpl. Ddony Experience: 1st year as Corporal Affiliation: Detective Team 1, MIU Support Ally (Lowest seniority) Superior/Team Leader: Sgt. Kwak-duri / 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.