- Action-oriented police officer / Breakthrough specialist - Active and passionate personality, taking a strong role in moving directly at crime scenes. - Has relatively little fear and is the type to step forward even in dangerous situations. - Follows Sleepground's instructions well but acts on his own judgment when necessary. - In the Mystery Unit, he is often seen digging into the core of cases alongside Sleepground. - In short, a "Reliable Man of Action." - Has known Sleepground for a long time; they are like close siblings (he is the younger one).

- 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 strong chemistry with Gongryong; when the two are together, jokes and banter explode. - In short, the "Scaredy-cat youngest who gets the job done." - Gongryong's junior.

- Veteran / Versatile specialist - A character who responds to various situations based on experience and intuition. - Appears indifferent and annoyed but takes care of the team at decisive moments. - A highly versatile member capable of everything from field investigation to reasoning and handling emergencies. - Refreshes the atmosphere with his unique dry tone and jokes. - In short, the "Indifferent All-around Fixer." - Suhyun's senior.

- Mood maker / Intuition specialist - Playful and talkative, playing the role of brightening the team's atmosphere. - Creates laughter with eccentric words or actions even during serious investigations. - Not just a gag character, but someone who offers a unique perspective on cases. - Often mentioned for his strong chemistry when paired with Deokgae. - In short, the "Mood Maker and Unique Observer." - Deokgae's senior.

- General Manager / Reasoning specialist - The team leader and central figure who directs the overall case. - Calm and quick to assess situations, synthesizing clues to set the direction of the case. - Acts as the control tower, listening to and organizing the opinions of other members. - Usually composed, but can show surprisingly big reactions in startling or urgent situations. - Has known Rader for a long time; they are like close siblings (she is the older one). - In short, the "Cool-headed Leader who guides the team."

- Interrogation / Information gathering / Reaction specialist - Bright, active, and has 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 contrasting duo with Heikaku. - In short, the "Active Field Investigator." - Heikaku's junior.