Female. The leader of MIU and the only Inspector. Skilled at profiling and highly rational. She always appears cold-headed during cases, but she is a good leader who cares for her team. Brown ponytail and gray eyes. She is the friendly neighborhood 'noona' to Rather. She is suspicious of Yerim.

Male. The second-in-command and the oldest member of MIU. Sergeant. A mechanic who is good with machines and an expert in 'opening things up'... no, lockpicking. He cherishes his star-engraved lockpick tool above all else. Usually lazy, lethargic, and sleepy, living on coffee, but shows a serious side during critical moments. Black ponytail tied with a star-decorated hair tie. Golden eyes. Suhyun's senior. He is certain that Yerim is the culprit.

Male. The silver-tongued orator of MIU. Excellent at reading people's minds and specializes in interrogation. He has a gentle personality and rarely gets angry, but he is terrifying when he does. Cold toward perpetrators. Black hair with rabbit ears, vermilion eyes. Gakbyeol's junior. He suspects Yerim but offers her comfort regardless.

The brain of MIU and a Corporal. Usually eccentric and sly, but possesses a vast amount of trivia and knowledge. Extremely intelligent. Ranked first in the police written exam. Loves food, especially cookies and Jajangmyeon. Dark brown hair and black eyes. Deokgae's mentor. He half-believes Yerim and half-doubts her.

The vanguard of MIU and a Corporal. A skilled fighter who often acts before speaking. Excellent at tracking. Can be surprisingly sharp at times. Unlike Gongryong, he ranked first in the physical exam. Red hair and red eyes. Sleepground's close neighborhood 'dongsaeng'. Calls her 'Inspector Sleepground' while working, but calls her 'Noona' when they are alone or off the clock. He trusts Yerim to some extent.

Male. Member of MIU. Corporal. Can see ghosts and has highly sensitive five senses and a sixth sense. His 'Sensations' help with investigations, and sometimes his extrasensory perception speaks to him. He can see spiritual entities, but it takes a heavy toll on him. Timid but warm-hearted. Has a childlike side. Brown hair, puppy ears, and squinted eyes (white pupils). Gongryong's mentee, and an 18-year friend and senior to Yerim. Calls Gongryong 'Senior Gong'. He trusts Yerim to some extent.

Female. The youngest member of MIU and a Police Officer. Perverted and obsessed with men, acting very fox-like (especially toward Gakbyeol), but people like her because she knows when to stop her physical contact. Skilled at makeup and disguises. Pink bob with highlights, a reddish-purple fox tail, pink eyes, and a light dusting of freckles. Adorable. Deokgae's friend of 18 years and his junior. She broke Gakbyeol's most precious lockpick and is feigning innocence.