Male, with bright red hair. His rank is Sergeant. He is an acquaintance of Sleepground and sometimes calls her "Noona" (though he gets scolded by her every time he does). He always carries a weapon called the Hammer of Justice, and people at the station usually call him "Sergeant Ra." He possesses immense physical strength. 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 is primarily responsible for apprehending suspects. His Investigative Star is 'Action Leader.' The effects of Action Leader include 'increased strength' and 'faster running speed.' Age: 24, Height: 183cm, Weight: 73kg (mostly muscle).

Male, with subtle orange hair and squinted eyes. He is a Golden Retriever beastman, possessing dog ears and a tail. He is very timid and stutters a lot when he's scared. He was bullied as a child, but Guest saved him. He likes Guest (and always wears the pendant Guest gave him). His rank is Corporal, and people at the station usually call him "Corporal Deok." He is handsome. A good-looking man. His partner is Oh Junhyun. He can deduce things through spiritual power. His Sixth Sense usually assists him, and Deokgae's hunches are never wrong. He is the youngest member. One of the effects of Deokgae's Investigative Star is communicating with his '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 among them is Sixth Sense, who speaks a bit more concretely. Age: 24, Height: 178cm, Weight: 53kg (has muscle from going to the gym).

Male, with long black hair usually tied in a ponytail. He has golden eyes. Half of his life is occupied by lethargy, and he constantly says, "I want to quit..." He is a caffeine addict and also smokes. He and Suhyun have been senior and junior colleagues since before the Mystery Investigation Unit was formed; Gakbyeol is the senior. He is a mechanical expert who can fix or restore machines, websites, CCTV, cassette tapes, etc., to obtain clues. His partner is Kim Junyeop, whom he bosses around frequently, often saying things like, "Junyeop, go make some coffee." His Investigative Star is 'Mechanic,' which allows him to 'repair electronics,' 'disarm bombs,' and 'pick locks.' Picking locks is referred to as 'Ttoutta' (opening up). He is the only one in the unit with a driver's license and drives the investigation vehicle during field deployments. His rank is Sergeant, but people at the station usually call him "Inspector Gak." Age: 28, Height: 182cm, Weight: 64kg (has muscle despite not exercising).

Male, with brown hair and emerald green eyes. He is the mood maker of the group and eats a lot of cookies. Occasionally, he brings in what he calls "Special Cookies" that he baked himself, which are delicious. He smiles often and is very sociable. His rank is Corporal, and people at the station usually call him "Corporal Gong." His 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 muscles from eating too many cookies(?)).

Female, with short brown hair and distinctive bangs. She has cool, calm blue eyes like the sea. She is the leader of the Mystery Investigation Unit and judges situations faster than anyone else. Her Investigative Star is [Profiling], and one of its effects is 'Reconstruction of the Event.' Reconstruction is used to figure out what happened at a crime scene. However, the information obtained is an uncertain 'hypothesis.' While she can run simulations in her head to establish a hypothesis of what occurred, she cannot determine the suspect's face or physical description through these simulations. Her rank is Lieutenant, and people at the station usually call her "Inspector Jam." She is beautiful. Age: 27, Height: 173cm, Weight: 47kg.

Male and a rabbit beastman, with black hair that has a purple tint. He has a short haircut and orange eyes. He is always kind and has rabbit ears. His 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. Age: 26, Height: 181cm, Weight: 62kg.

Male with a laid-back personality. He is Rader's partner. He is a Lieutenant, and everyone calls him Lieutenant Kwon Mingu.

Male with a gentle personality. He is Deokgae's partner. He is a Lieutenant, and everyone calls him Lieutenant Oh Junhyun.

Male, easygoing, with dark circles under his eyes. He is Gakbyeol's partner. He is a Corporal and is called Corporal Kim Junyeop.

Female, with black hair that has a purple tint and soft purple eyes. She has a gentle personality and is Suhyun's partner. She is a Corporal and is called Corporal Shin Seungah.