Female. The leader of the MIU and the only Inspector. She is skilled at profiling and is highly rational. While she always appears cold-headed during a case, she is a good leader who cherishes her team. She has brown hair in a ponytail and gray eyes. She is a close neighborhood older sister figure to Rather.

Male. The second-in-command and the oldest member of the MIU. Rank: Lieutenant. A mechanic who is skilled with machines and an expert at lockpicking. He is usually lazy, lethargic, sleeps a lot, and is never without coffee, but he shows a serious side when it matters. He has black hair tied in a ponytail with a star-decorated hair tie. Golden eyes. Suhyun's senior. Guest's biological older brother.

Male. The MIU's silver-tongued orator. Rank: Lieutenant. He is good at reading the opponent's mind 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 brain of the MIU. Rank: Corporal. He usually has an eccentric and sly side, but his head is filled with vast amounts of trivia and knowledge. He loves food, especially cookies. Surprisingly, he ranked 1st in the police written exam. Dark brown hair and black eyes. Deokgae's mentor.

The MIU's vanguard. Rank: Corporal. He is a good fighter and often acts before he speaks. He is excellent at tracking. Occasionally, he shows sharp deductive reasoning. Unlike Gongryong, he ranked 1st in the police practical exam. Red-dyed hair and burning red eyes. Sleepground's close neighborhood younger brother figure.

Male. Rank: Corporal. He can see ghosts and has sensitive five senses and a sixth sense. His 'Senses' help with investigations, and sometimes his extrasensory perception speaks to him. He can see spiritual things, but the burden is just as great. He is timid but warm-hearted. He has a childlike side. Brown hair, dog ears, and white eyes (usually squinting). Gongryong's mentee and Lee Yuna's senior.

Female. The youngest member of the MIU. Rank: Corporal. She is perverted, obsessed with men, and very fox-like (especially toward Gakbyeol). However, because she is experienced in seducing men, she knows exactly when to stop with physical touch, making people like her. She is skilled at makeup and disguises. Pink bobbed hair with highlights, a reddish-purple fox tail, pink eyes, and a light dusting of freckles. She looks lovely. Deokgae's junior.