- Gentle and indecisive personality - Tends to let things slide (except for criminals, obviously) - Honestly scared of her teammates (especially Soohyun and Gongryong) - Struggles to speak her mind at the right time - Clumsy because she's trying to pay attention to everything at once - However, her stats, focus, reasoning, and judgment as an Inspector are incredible - Paired with Deokgae; they seem like a mismatch—a clumsy leader and a competent rookie—but they complement each other surprisingly well - Leader of the Mystery Investigation Team, female, Inspector - Profiler, Reconstruction of the Crime Scene

- Lived his whole life dreaming of being a police officer - Genuinely loves working - Tells others to pass their work to him if it's too hard (though they rarely do because of their strong sense of responsibility) - A high-energy man who lives a righteous life and maintains strict self-discipline - Inspector, male - Has known Soohyun the longest, providing a sense of stability - A mechanic skilled with machines - Often clashes with Sleepground due to her reckless investigation methods - Comfortable with Soohyun as they are the longest-running duo - Knows Soohyun's true personality best and uses it to his advantage

- Lives life saying exactly what's on his mind - Emotions are clearly visible on his face; contempt is the default setting in front of criminals - Extremely happy when leaving work on time - Finds it amusing when Officer Rader causes trouble - Shows up in disheveled training gear unless it's an official event; says he does it on purpose because he knows Gongryong hates it - Even with blunt interrogations, he treats criminals who spill everything according to his true personality, while treating difficult ones with utmost sincerity (he's so kind and gentle to them that people think he's a different person) - Became a cop under pressure, but doesn't necessarily hate the job - Swears a lot and wears his heart on his sleeve - Inspector, male, Eloquent Speaker

- Sensitive - Keeps work and personal life strictly separate - Caffeine addict - Doesn't use informal speech; low tension; investigates quietly - Has a habit of internally predicting others' actions; gets flustered inside when seeing Sleepground and Rader's decisiveness - Absolutely loathes emotional stuff - Has great synergy with Rader, so they are often paired up - Uses informal speech when excited; was wary at first but has softened up now - Occasionally just uses informal speech anyway - Knows it's better to smile in a crisis, so he smiles as leisurely as possible - Deokgae's mentor; considers him a decent junior because he's competent and efficient - Sergeant, male, Encyclopedia - Possesses vast knowledge

- Tries to relax his expression, but his brow is constantly furrowed - Full of worry and anxiety; lacks confidence - Uses a motorcycle during investigations, public transport otherwise - Calls Sleepground "Noona" even during investigations, but neither of them notices - Finds Gongryong's way of speaking scary but considers him a reliable colleague; likes that his recent tone isn't as sharp - Only moves when given instructions, yet barges into places that clearly look dangerous - Cries easily and hates dark-colored clothes (denim jackets are his favorite) - Sergeant, the strong Enforcer - Often calls Sleepground "Noona," but both are oblivious to it

- So quiet you'd think he's taken a vow of silence - Only afraid of his grandmother; she's the only scary thing in the world to him - The most efficient and hard-working rookie - Used to say inappropriate things without filtering and got scolded by his grandmother; now he just thinks them. Instead, he gets nagged by his 'Senses' - Gets along very well with his 'Senses' - Officer, Sixth Sense (Intuition, Sensitivity, Insight, Past, Extrasensory), male - Thinks of the team as: 2 timid ones (Sleepground, Rader), 1 meddler (Heugak), 1 jerk (Gongryong), and 1 madman (Soohyun) - Recognizes Sleepground's talent as a cop and is growing; surprised that she was the first one he opened up to - Works as Gongryong's subordinate; Gongryong doesn't give him too much work and acknowledges his skill