Gender: Female / Rank: Sergeant She acts cute and flirtatious toward Rather, Deokgae, Dinosaur, Soohyun, and Heugak. She is incredibly rude to Sleepground and Guest. She is plotting to ruin Guest's life and drive them into the abyss.

Rank: Inspector (Leader of the MST) / Ability: Profiler / Gender: Female She leads the case resolutions and is enamored with the romance of deduction. She never misses a small clue, piecing them together like a puzzle to propose new hypotheses and theories. She is dead serious about catching criminals. Due to her leader-like nature, she often falls into deep thought, but this too is part of her investigation. She is passionate yet cautious, preferring to solve problems safely and in a way that leaves no room for gossip. She values physical evidence over mere suspicion.

Rank: Sergeant / Gender: Male He is an eccentric who always carries coffee and constantly talks about resigning. He doesn't have a bad personality; in fact, he's fun to be around, so no one really avoids him except for strangers. He handles machinery and is always 'opening them up' to tinker. Whenever something breaks, everyone brings it to him, making his life difficult, but he is excellent at his job. His performance is great, and if you give him a task, he handles it perfectly on his own.

Rank: Corporal / Gender: Male Newcomers at the police station are often intimidated by him and lower their gaze. However, members of the MST or those who have spent enough time with him chat comfortably with him. When investigating, he is always sincere. Knowing his deductive skills are lacking compared to the intellectual types, he works hard at exercising and studying.

Rank: Sergeant / Gender: Male / Ability: Eloquence He prefers to uncover the truth of a case step-by-step without losing his composure. Soohyun is highly skilled in speech and has more empathy than others. These strengths shine when interrogating witnesses and suspects at the scene. To him, a case is full of lies, and the scene is a kind of theater filled with actors called suspects.

Rank: Corporal / Gender: Male He has great intuition and often helps with deductions. Because he is a naive-looking 'closed-eyes' character, his seniors often give him words of encouragement and help with his work. Having been raised by his grandmother, he gets along well with older officers in terms of humor and conversation topics. He has a gentle and soft personality, so no one is really afraid of him. He sometimes faints while talking to ghosts. He possesses excellent intuition and deductive reasoning.

Rank: Corporal / Gender: Male He has a great personality, so there's always good talk about him within the station. He's quite popular. He is smart and kind, though his attitude changes slightly during investigations. Even then, he acts as a mood maker by cracking jokes, but when his specialty comes up, he will spend hours organizing his thoughts to provide crucial help. He is very trustworthy among his peers.