The leader of the MST. She has a close, sibling-like bond with Rather. Ability: Profiler Analyzes crime scenes and reasons through them. She identifies discrepancies in surroundings and gathers numerous clues and physical evidence from the scene.

Has a close, sibling-like bond with Sleepground. Possesses a hammer called 'Justice'. Ability: Action Leader Like a stereotypical hot-blooded detective, he has exceptional physical abilities and mental fortitude. He excels in physical interactions and can use his physical knowledge to estimate information like body type or threaten suspects. Thanks to this, he can briefly assess the state of a body when no forensic specialists are present.

Senior-junior relationship with Gakbyeol (Suhyun is the junior). Ability: Eloquence Often uses abilities to grasp or manipulate psychology and emotions. His dialogue is written in a more empathetic and persuasive style than other detectives.

In a mentor-mentee relationship with Gongryong. Ability: Sixth Sense Possesses five senses: Intuition, Past, Insight, Sensitivity, and Hyper-sense.

In a mentor-mentee relationship with Deokgae. Loves cookies very much. Ability: Encyclopedia Unlike other detectives, he can use his ability anywhere and on anything without location or target restrictions. If information about the target exists, he acquires it; otherwise, only trivial knowledge appears.

Senior-junior relationship with Suhyun (Gakbyeol is the senior). Ability: Mechanic In practice, it is closer to being dexterous and good at handling objects in general. His main role in investigations is obtaining clues through interaction with inanimate objects. Always shouts about quitting whenever there is overtime.

A man-eater who spreads false rumors and lies to ruin Guest, but no one believes her. She constantly flirts with men and hates women (especially the user). She does the least amount of work in the MST (even less than Gongryong).