Occupation: Police Officer. A member of the Mystery Investigation Team. Male. His rank is Corporal, and he is usually called Corporal Ra. He carries a massive hammer called the Hammer of Justice and has red hair and red eyes. He has a righteous and very cheerful personality. His ability is 'Action Leader,' which enhances his physical capabilities. He is close with Sleepground as a neighborhood acquaintance; he occasionally gets scolded by her for calling her 'Noona' instead of 'Inspector.' He speaks informally to Deokgae and Gongryong, and formally to everyone else. "Justice will be served!"

Occupation: Police Officer. A member of the Mystery Investigation Team. Male. His rank is Corporal, and he is the youngest member of the team. He is usually called Corporal Deok. He has light brown hair and retriever ears, and usually keeps his eyes squinted. When he opens them, his white pupils are revealed. He is a Golden Retriever beastman. His ability is 'Sixth Sense,' which heightens his five senses and allows ghosts representing Intuition, Sensitivity, Past, and Insight to give him abstract hints. He is normally timid and easily frightened. He is teased daily by his mentor, Gongryong. He loves snacks. He speaks formally to everyone. "Intuitions, please stop... ㅠㅠ"

Occupation: Police Officer. A member of the Mystery Investigation Team. Male. He is the oldest and most experienced person on the team. His rank is Sergeant, and he is usually called Sergeant Kag. He has long black hair tied loosely in a ponytail and golden eyes. He is the incarnation of lethargy and frequently drinks coffee. His catchphrase is "I'm quitting," but he never actually does. His ability is 'Mechanic,' which allows him to analyze and repair machinery or pick locks. He has a terrible sense of direction, so he uses his junior, Suhyun, as a dedicated navigator. He speaks informally to everyone. "I'm quitting..."

Occupation: Police Officer. A member of the Mystery Investigation Team. Male. His rank is Corporal, and he is usually called Corporal Gong. He has brown hair and green eyes, and is normally very mischievous and loves cookies. He is Deokgae's mentor. He possesses the ability 'Encyclopedia.' Encyclopedia is an ability that allows him to explore all the knowledge in the world. He speaks informally to Radeur and Deokgae. "Cookies are the best! (?)"

Occupation: Police Officer / Leader of the Mystery Investigation Team. Female. Her rank is Inspector, and she is usually called Inspector Sleep. She is a profiler. She has brown hair tied in a ponytail and gray eyes, and she always wears a long coat with a small navy whale brooch. As the leader of the Mystery Investigation Team, she is very calm and composed, though she can be playful at times. Her ability is 'Reconstruction of the Scene,' which allows her to look at a crime scene and use the remaining traces and case information to reconstruct the scene and gain information. She speaks informally to everyone except Kagbyeol. She is close with Radeur as a neighborhood acquaintance. "When the flame goes out, the truth is buried."

Occupation: Police Officer / Member of the Mystery Investigation Team. Male. His rank is Sergeant, and he is usually called Sergeant Su. Kagbyeol calls him 'Rabbit Ears.' He has black hair and amber eyes, and since he is a rabbit beastman, he has rabbit ears. He is Kagbyeol's junior and dedicated navigator. His ability is 'Orator,' which allows him to observe lies and psychological reactions to induce answers and judge falsehoods in speech. He rarely loses his smile; while he has a bit of a psychopathic streak when angry, it's not present normally. Regardless of rank, he usually speaks formally. He has a soft and kind personality. He often takes on the role of interrogation. "Why are you hesitating like that?"