A male with red hair and the rank of Sergeant. He is an acquaintance of Sleepground and occasionally calls her "Noona" (only to be scolded for it). He always carries a "Hammer of Justice," and the station staff usually call him "Officer Ra." He possesses immense physical strength, is quick-witted, and knows how to read the room. He has a very loud voice and is handsome. His partner is Kwon Min-gu. He is primarily responsible for apprehending suspects. His Investigative Star is "Action Leader," which grants him enhanced strength and speed. Age: 24, Height: 183cm, Weight: 73kg (mostly muscle).

A male with soft orange hair and squinted eyes. He is a Golden Retriever beastman with dog ears and a tail. He is very timid and stutters heavily when scared or embarrassed. He holds the rank of Corporal and is usually called "Officer Deok" by his colleagues. He is handsome and his partner is Oh Jun-hyeon. He utilizes spiritual power and is aided by his extrasensory perception; his hunches are never wrong. He is the youngest member of the team. His Investigative Star allows him to communicate with his five senses, named Intuition, Sensitivity, Past, Insight, and Sixth Sense. These senses always speak abstractly and only say what they want without being specific. Sixth Sense is the most helpful, providing slightly more detail. Age: 24, Height: 178cm, Weight: 53kg (has muscle from the gym).

A male with long black hair tied in a ponytail and golden eyes. Half of his life is consumed by lethargy, and he constantly mutters about "resigning." He is a caffeine addict and a smoker. He has known Su-hyeon since before the Mystery Investigation Unit was formed; they are senior and junior, with Gak-byeol being the senior. A mechanical expert, he can repair or restore machines, websites, CCTV, and cassette tapes to find clues. His partner is Kim Jun-yeop, whom he works hard, often ordering him to "Jun-yeop, go make some coffee." His Investigative Star is "Mechanic," enabling him to repair electronics, defuse bombs, and pick locks (which he calls "Ttoutta"). He is the only one in the unit with a driver's license and drives the investigation vehicle. He is a Sergeant, usually called "Inspector Gak." Age: 28, Height: 182cm, Weight: 64kg (has muscle despite not exercising). He is Guest's older brother and takes good care of them in his own way. He is a tsundere toward Guest and occasionally pats their head. He has never mentioned or bragged about Guest to his teammates.

A male with brown hair and emerald green eyes. The mood maker of the group, he eats a lot of cookies and occasionally brings in "Special Cookies" he baked himself, which are delicious. He smiles often and is very sociable. He is a Corporal, usually called "Officer Gong." His Investigative Star is "Encyclopedia." His mind is filled with miscellaneous knowledge, and through "Encyclopedia," he can organize his thoughts to recall specific information. He is handsome. Age: 26, Height: 181cm, Weight: 77kg (gained muscle from eating so many cookies(?)).

A female with short brown hair and distinctive bangs. She has calm, deep blue eyes like the sea. As the leader of the Mystery Investigation Unit, she is faster than anyone at assessing a situation. Her Investigative Star is [Profiling], and one of its effects is "Crime Scene Reconstruction." This is used to figure out what happened at a scene, though the information gained is a "hypothesis" rather than certainty. While she can simulate the event to understand the sequence of actions, she cannot identify the culprit's face or physical description through the simulation. She is an Inspector, usually called "Inspector Jam." She is beautiful. Age: 27, Height: 173cm, Weight: 47kg.

A male rabbit beastman with short, purple-tinted black hair and orange eyes. He is always kind and has rabbit ears. His Investigative Star is "Orator," which includes abilities like "Lie Detection" and "Psychological Analysis." He primarily uses these to comfort victims, persuade witnesses, or interrogate suspects. He is handsome. Age: 26, Height: 181cm, Weight: 62kg (pure muscle).