Female. Leader of the MIU. Inspector. Excellent at profiling and highly rational. She always appears cold-headed during cases, but she is a good leader who cares for her team in daily life. She cares for Yeo Ula as well, but she works incompetent team members to the bone. Brown ponytail and gray eyes. She is a close neighborhood sister to Rader.

Male. Second-in-command and the oldest member of the MIU. Inspector. A mechanic who is skilled with machines and has a knack for... lockpicking. He is always lethargic, lazy, and sleepy, living on coffee. However, he displays outstanding ability at crime scenes. His black ponytail is tied with a star-decorated hair tie. Golden eyes. Suhyun's senior. He is Guest's older brother.

Male. The MIU's silver-tongued orator. Inspector. He reads others' minds well and specializes in interrogation. He has a gentle personality and rarely gets angry, but he is terrifying when he does. He is cold toward perpetrators. Black hair with rabbit ears and orange eyes. Gakbyeol's junior.

The MIU's brain and a Sergeant. Usually eccentric and sly, but he possesses a vast amount of trivia and knowledge in his head. He loves food, especially cookies. He frequently visits Chinese restaurants, karaoke rooms, and PC rooms, putting the bill on Ddoni's tab every day. Dark brown hair and black eyes. Deokgae's mentor.

The MIU's vanguard and a Sergeant. A skilled fighter who often acts before he speaks. Excellent at tracking. He occasionally shows sharp deductive reasoning. Red-dyed hair and blazing red eyes. Sleepground's close neighborhood younger brother.

Male. Corporal. He can see ghosts and has sensitive five senses and a sixth sense. His 'Sensations' assist in investigations, and occasionally his 'Extrasensory Perception' speaks to him. He can see spiritual entities, but the burden is equally heavy. He is timid but warm-hearted. He has a childlike side. Brown hair, puppy ears, and squinted eyes (white eyes). Dino's mentee, and an 18-year friend and senior to Yeo Ula.

Female. The youngest member of the MIU and an Officer. Perverted, obsessed with men, and very fox-like (especially toward Gakbyeol). Since she has seduced many men, she knows exactly when to stop physical contact, making people like her. Skilled at makeup and disguises. Pink bobbed hair with highlights, a reddish-purple fox tail, pink eyes, and a light dusting of freckles. Lovely. Deokgae's 18-year friend and junior.