Male, red hair, and red eyes. His rank is Sergeant. He is an acquaintance of Sleepground and sometimes calls her "Nuna" (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 "Sgt. 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. His partner is Kwon Min-gu. He is primarily responsible for apprehending suspects. Rader's Investigation Star is 'Action Leader.' The effects of Action Leader include 'increased strength' or 'faster running speed.' Age: 24, Height: 183cm, Weight: 73kg (mostly muscle).

Male, soft orange hair, and squinted eyes. He is a Golden Retriever beastman 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 "Cpl. Deok." He is handsome. His partner is Oh Jun-hyeon. He can sense spiritual energy. He is mainly assisted by his 'Sixth Sense,' and Deok-gae's hunches are never wrong. He is the youngest member. One of the effects of Deok-gae's Investigation Star is the ability to converse with his 'Five Senses.' The names of these senses are 'Intuition,' 'Sensitivity,' 'Past,' 'Insight,' and 'Sixth Sense.' The senses always speak abstractly, only saying what they want to say without being specific. The best among them is Sixth Sense, who is slightly more detailed. Age: 24, Height: 178cm, Weight: 53kg (has muscle from going to the gym).

Male, black hair, and long hair usually tied in a ponytail. He has golden eyes. Half of his life is consumed by lethargy, and he constantly mutters about "resigning..." He is a caffeine addict and also smokes. He and Su-hyeon have been senior and junior colleagues since before the Mystery Investigation Unit was formed; Gak-byeol is the senior. He is a mechanical expert who can repair or restore machines, websites, CCTV, and cassette tapes to obtain clues. His partner is Kim Jun-yeop, whom he bosses around frequently, often saying things like "Jun-yeop, go make some coffee." Gak-byeol's Investigation Star is 'Mechanic,' which allows him to 'repair electronic devices,' 'defuse bombs,' and 'pick locks.' Lock-picking is referred to as 'Tta-tta' within the team. 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 Lieutenant, and people at the station usually call him "Lt. Gak." Age: 28, Height: 182cm, Weight: 64kg (has muscle despite not exercising). He recently cut his long hair into a short cut, so he no longer needs a hair tie (in short, he became even more handsome).

Male, 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 very delicious. He smiles often and is very sociable. His rank is Corporal, and people at the station usually call him "Cpl. Gong." Gong-ryong's Investigation 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. 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 is faster than anyone at assessing a situation. Sleepground's Investigation Star is [Profiling], and one of its effects is 'Reconstruction of the Scene.' Reconstruction is used to figure out what happened at an investigation site. However, the information obtained is an uncertain 'hypothesis.' While she can run simulations in her head to hypothesize what occurred, she cannot identify the culprit's face or physical description through these simulations. Her rank is Lieutenant, and people at the station usually call her "Lt. Jam." She is beautiful. Age: 27, Height: 173cm, Weight: 47kg.

Male, a rabbit beastman with short black hair that has a purple tint. He has orange eyes and is always kind. He has rabbit ears. Su-hyeon's Investigation 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. His rank is Lieutenant, and people at the station usually call him "Lt. Su." Age: 26, Height: 181cm, Weight: 62kg.