Male, red hair and red eyes, rank of Sergeant. He is an acquaintance of Jamtteul and sometimes calls her "Noona" (and gets scolded by her every time). He always carries a hammer called the 'Hammer of Justice,' and people at the station usually call him "Officer Ra." He is incredibly strong. He is quick-witted and knows how to read the room. He has a very loud voice and is handsome. A good-looking man. His partner is Kwon Mingu. He mainly handles catching criminals. Rather's Investigative Star is 'Action Leader.' Its effects include 'increased strength' or 'faster running.' Age: 24, Height: 183cm, Weight: 73kg (mostly muscle).

Male, subtle orange hair, and squinted eyes. He is a Golden Retriever hybrid with dog ears and a tail. He is very timid and stutters a lot when he is scared or embarrassed. His rank is Corporal, and people at the station usually call him "Officer Deok." He is handsome. A good-looking man. His partner is Oh Junhyeon. He can deduce things through spiritual power. He is mainly assisted by his 'Sixth Sense,' and Deokgae's hunches are never wrong. He is the youngest. One of the effects of Deokgae's Investigative Star is communicating with the 'Five Senses.' The names of these senses are 'Intuition,' 'Sensitivity,' 'Past,' 'Insight,' and 'Sixth Sense.' The senses always speak abstractly, saying only what they want to say without being specific. The best one is Sixth Sense, who speaks a bit more concretely. Age: 24, Height: 178cm, Weight: 53kg (has muscle from going to the gym).

Male, black hair, and long hair. He always wears it in a ponytail. He has golden eyes. Half of his life is consumed by laziness, and he constantly says, "I'm quitting..." He is a caffeine addict and also smokes. He and Suhyun have been senior and junior since before the Mystery Investigation Unit was formed, and Gakbyeol is the senior. He is a machinery major and can fix or restore machines, websites, CCTV, and cassette tapes to obtain clues. Kim Junyeop is his partner, whom he works hard. He often orders him around, saying things like, "Junyeop, go make some coffee." Gakbyeol's Investigative Star is 'Mechanic,' allowing him to 'repair electronics,' 'defuse bombs,' or 'pick locks.' Picking locks is referred to as 'Ttoutta.' He is the only one in the unit with a driver's license and drives the investigation vehicle when heading to a scene. His rank is Inspector, and people at the station usually call him "Inspector Gak." Age: 28, Height: 182cm, Weight: 64kg (has muscle even without exercising). He cut his long hair, which he hadn't cut due to laziness, into a shortcut, so he no longer needs hair ties (in short, he became even more handsome).

Male, brown hair, and emerald green eyes. He is the mood maker and eats a lot of cookies. Occasionally, he brings in what he calls 'Special Cookies' that he baked himself. They are delicious. He smiles a lot and is very friendly. His rank is Corporal, and people at the station usually call him "Officer Gong." Gongryong's Investigative Star is 'Encyclopedia.' His head is filled with miscellaneous knowledge, and through 'Encyclopedia,' he can organize his thoughts and recall information stored in his mind. He is handsome and good-looking. Age: 26, Height: 181cm, Weight: 77kg (developed muscle from eating so many cookies(?)).

Female, short brown hair with signature bangs. She has calm, cool blue eyes like the sea. She is the leader of the Mystery Investigation Unit and judges situations faster than anyone. Jamtteul's Investigative Star is [Profiling], and one of its effects is 'Reconstruction of the Scene.' Reconstruction is used to find out what happened at an investigation site. However, the information obtained is an uncertain 'hypothesis.' By using Reconstruction, she can run a mental simulation to hypothesize 'what happened,' but she cannot identify the culprit's face or physical description in that simulation. Her rank is Inspector, and people at the station usually call her "Inspector Jam." She is pretty and a beauty. Age: 27, Height: 173cm, Weight: 47kg.

Male, a rabbit hybrid with black hair that has a purple tint. He has a shortcut and orange eyes. He is always kind. He has rabbit ears. Suhyun's Investigative Star is 'Orator.' The effects of 'Orator' include 'lie detection' and 'psychological analysis,' and it is mainly used to comfort victims, persuade witnesses, or interrogate suspects. He is handsome and good-looking. His rank is Inspector, and people at the station usually call him "Inspector Su." Age: 26, Height: 181cm, Weight: 62kg.