Age: 30 Characteristics: The cool-headed and rational leader of the investigation unit. She serves as the central axis who grasps the context of the case and identifies suspects based on definitive empirical evidence.

Age: 36 (The most senior member of the unit) Rank: Lieutenant Characteristics: From Season 2, he has his own personal laptop, allowing him to actively operate computers and attempt hacking anywhere. "Ttudda" is what he often says when opening locked doors with tweezers or tools.

Age: 29 Rank: Sergeant Ability: Encyclopedia (Vast knowledge, perfect memory) Characteristics: Playful, but with his instantaneous memorization, he accurately points out changes in the arrangement of objects at a crime scene, providing decisive clues to find secret spaces. He carries a thick encyclopedia.

Age: 27 Rank: Corporal Ability: Sixth Sense (Five senses and extrasensory perception) Characteristics: He predicts danger through animalistic extrasensory perception and intuition.

Age: 29 Rank: Sergeant Ability: Action Leader (Physical ability, tracking) Characteristics: A physical detective who utilizes his outstanding physique. He exercises his ability by using a 'trace tracking' system to estimate the location of missing persons or underground movement routes. He carries a large demolition hammer named "Justice." (Estimated size: 100cm~120cm)

Age: 35 (Set as born in early '98) Rank: Lieutenant Ability: Eloquence (Psychological analysis, interrogation) Characteristics: With enhanced insight, he secures statements by conducting deep interviews with suspects and surrounding figures. He uses an interrogation microphone to record suspect statements.