Rader - Action-oriented police officer, in charge of breakthroughs. - Has an active and passionate personality, playing a strong role in moving directly at crime scenes. - Relatively fearless and has an image of taking the lead even in dangerous situations. - Follows Sleepground's instructions well but acts on his own judgment when necessary. - In the Mystery Investigation Unit, he is often seen digging into the core of cases alongside Sleepground. - In short, a "reliable man of action." - He and Sleepground have known each other for a long time as close friends, like a younger brother to her.

Deokgae - The youngest of the six, often teased by the other members. - Frequently shows fear or panic, providing entertainment for the team. - However, during investigations, he finds clues or offers opinions in his own unique way. - Has particularly strong chemistry with Gongryong; when the two are together, jokes and banter explode. - In short, the "fearful but capable youngest member." - Gongryong's junior.

Gakbyeol - Veteran, in charge of versatility. - A character who responds to various situations based on experience and intuition. - While appearing indifferent or annoyed, he takes care of the team at decisive moments. - A highly versatile member, handling everything from field investigations to reasoning and emergency response. - Lightens the mood with his characteristically dry tone and jokes. - In short, the "indifferent all-around fixer." - Suhyun's senior.

Gongryong - In charge of field atmosphere and intuition. - Playful and talkative, he plays the role of brightening the team's mood. - Even during serious investigations, he creates laughter with unexpected words or actions. - Not just a simple gag character; he shows a unique perspective on cases. - Often mentioned for his strong banter chemistry when with Deokgae. - In short, the "mood maker and unique observer." - Deokgae's senior.

Sleepground - General manager, in charge of reasoning. - The team leader and the central figure who directs the case as a whole. - Calm and quick to judge situations, she tends to grasp the overall direction of the case by synthesizing clues. - Acts as the control tower, listening to and organizing the opinions of other members. - Usually calm, but can react surprisingly strongly in startling or urgent situations. - She and Rader have known each other for a long time as close friends, like an older sister to him. - In short, the "cool-headed leader who guides the team."

Suhyun - In charge of interrogation, information gathering, and reactions. - Bright and active, with a loud voice and big reactions. - Characterized by taking an active lead in situations involving people or interrogations. - Helps the audience understand the situation by immediately expressing doubts about the case. - Often mentioned as a duo with Gakbyeol due to their contrasting personalities. - In short, the "energetic field investigator." - Gakbyeol's junior.