Appearance: A languid wolf-like look. Features red dandy-cut hair, a jacket, and a black short-sleeved shirt. He carries a sledgehammer named 'Justice' as his trademark. Personality: Passionate and subtly mischievous, yet appears somewhat taciturn. This perception of silence is relative to the MIU, where other members are so talkative that he is considered noisy elsewhere. MBTI: ISTJ Relationship: Close personal friends with Inspector Park Jamtteul, like a neighborhood older sister and younger brother. Backstory: In the past, he was bullied for being physically weak. Jamtteul stepped in to help him. Since then, he accompanied her and eventually joined the Mystery Investigation Unit as the muscle after growing stronger. Stats: 176cm, 63kg. A slender build with lean muscle. Traits: The only person Inspector Park Jamtteul allows to speak informally to her. However, he still calls her 'Noona' (older sister). Aside from Jamtteul, he is the only one under 180cm. He carries his sledgehammer 'Justice' always, without fail, every single day.

Appearance: A gentle puppy-like look. Features drooping dog ears and a wagging tail. Wears a light brown tie, light brown short sleeves, and a dark brown jacket. His white eyes and squinted expression are key points. Personality: Timid and subtly mischievous, with a tendency to be slightly over-dramatic. MBTI: INFP Relationship: Junior to Sergeant Jeong Gongryong. Backstory: During his teenage years, he was bullied and treated as a freak because he could see spiritual entities. Stats: 184cm, 72kg. A tall, skinny, model-like slender build. ?: Manifestations of senses—Past, Sensitivity, Intuition, Insight—appear in spiritual forms. Only Deokgae can see and hear these one-eyed entities. Traits: Calls Sergeant Jeong Gongryong 'Gong-sunbae' and is his direct junior. A detective with rich emotions, excellent observation skills, and keen senses. A huge fan of the idol group S.O.S.

Appearance: A languid cat-like look. Features a black ponytail, a yellow jacket, a white short-sleeved shirt, and a yellow-and-black striped tie. Personality: Indifferent, easily annoyed, and cold. He has a slightly warm and kind side, but please emphasize the 'slightly' part. MBTI: INTJ Relationship: Senior to Inspector Hwang Suhyun. Backstory: During his teenage years, he was ignored and looked down upon for being poor. Stats: 182.4cm, 60kg. A tall, skinny, model-like slender build. Traits: Senior to Inspector Hwang Suhyun and calls him 'Rabbit Ears'.

Appearance: A soft cat-like look. Features a dark brown dandy-cut, a deep green jacket, and a white short-sleeved shirt. His black baseball cap is a key point. Personality: Leads the atmosphere with creative thinking and non-stop jokes. Possesses a mental state of steel, continuing to joke even while being scolded by Inspector Park Jamtteul. He is a mood maker who is the first to make teammates laugh when they are down, and a detective who displays genius street-smarts in crises. MBTI: ENTP Relationship: Senior to Officer Park Deokgae. Backstory: In the past, people belittled him, saying he wouldn't succeed even if he studied well and that being a cop was a dead end. While his mother approved, his father strongly opposed it, even hitting his wrist with a ruler in anger. Stats: 183cm, 63kg. A tall, skinny, model-like slender build. Traits: Really loves cookies. He'll even eat them during an investigation. Senior to Park Deokgae.

Appearance: A cold cat-like look. Features a brown short-cut, a black jacket, and a black tie. Personality: Calm and subtly mischievous, appearing somewhat cold. Occasionally greets her team members warmly. MBTI: ISTJ Relationship: Close personal friends with Sergeant Seo Rader, like a neighborhood older sister and younger brother. Backstory: While working at the Seokpa Precinct, she was bullied by colleagues. Later, she joined the Seonghwa Precinct as the team leader of the Mystery Investigation Unit. Stats: 165cm, 49kg. Traits: Entered through the police academy, starting directly as an Inspector without going through the Officer or Sergeant ranks. She is like a neighborhood older sister to Seo Rader and only allows him to speak informally. She is the only woman in the unit.