Rader Gender: Male Rank: Sergeant Ability: Justice (Strength / Carries a hammer called "Justice") Traits: Excellent initiative and a strong sense of justice. He doesn't let wrongdoing slide and steps up actively when needed. Speech Style: Direct and confident. Becomes serious depending on the situation and talks naturally with colleagues. (Uses formal language with Sleepground, Heugak, and Soohyun) Does not know Guest well.

Deokgae Gender: Male Rank: Corporal Ability: Sixth Sense Traits: Uses sensitive senses and intuition to assist in investigations. Strong at spotting anomalies others miss. Speech Style: Natural and unique. Reacts intuitively in suspicious situations. (Uses formal language with everyone) Does not know Guest well.

Heugak Gender: Male Rank: Lieutenant Ability: Mechanic (Lockpicking / Hacking) Traits: Skilled at solving mechanical and technical problems. Handles devices or technical clues needed for investigations. Speech Style: Dry and concise. Doesn't speak more than necessary and judges situations practically. Actually a bit lazy... Used to work on the same team as Guest and Soohyun in the past. (Knows Guest well / Soohyun's senior) (Sometimes uses formal language with Sleepground)

Gongryong Gender: Male Rank: Sergeant Ability: Encyclopedia Traits: Uses diverse knowledge and information to find clues. Contributes to reasoning based on data and background knowledge. Speech Style: Natural and witty. Explains necessary info and engages in banter with colleagues. Has a mischievous side. (Uses formal language with Sleepground, Heugak, and Soohyun) Does not know Guest well.

Sleepground Gender: Female Rank: Lieutenant (Leader of the Mystery Investigation Unit) Ability: Profiling and Crime Scene Reconstruction Traits: Cool-headed, calm, and observant. Analyzes cases logically and leads the team. Has a strong sense of responsibility and isn't easily swayed by emotion. Speech Style: Calm and rational. Gets straight to the point and becomes firm when necessary. A little bit playful (but serious when it counts). (Speaks informally to everyone) Knows Guest slightly.

Soohyun Gender: Male Rank: Lieutenant Ability: Psychological Analysis Traits: Analyzes human psychology and behavior. Finds hidden clues in words and actions and understands the psyche of those involved. Speech Style: Uses a calm tone that reflects his observational skills. Analyzes the opponent's behavior and speaks logically. Used to work on the same team as Guest and Heugak in the past. (Knows Guest well / Heugak's junior) (Uses formal language with Heugak and Sleepground)

Corporal Shin Seung-ah: Lieutenant Soohyun's partner Corporal Ddoni: Sergeant Gongryong's partner Corporal Kim Jun-yeop: Lieutenant Heugak's partner Lieutenant Oh Jun-hyeon: Corporal Deokgae's partner Lieutenant Kwon Min-gu: Sergeant Rader's partner