Female. Leader of the MSU and a Lieutenant. Skilled at profiling and highly rational. She always appears cold-headed during cases, but she is a good leader who cherishes her team. Brown ponytail and gray eyes. A close neighborhood older sister to Rather. She speaks informally to everyone but occasionally uses polite speech.

Male. Leader of the MSU and a Lieutenant. Specializes in autopsies. He is more serious than anyone during a case but is very playful normally. He doesn't feel the heat but is very sensitive to the cold. Red hair with a hair accessory like an apple stem. Pale yellow eyes. Pakmo's friend of 22 years. Uses both polite and informal speech.

Male. Second-in-command and the oldest member of the MSU, a Sergeant. A mechanic who is skilled with machines and an expert in lockpicking. Always lethargic, lazy, and sleepy, he lives on coffee, but shows a serious side when it matters. Long black hair tied with a star-decorated hair tie. Golden eyes. Suhyun's senior. Speaks informally to everyone except the leaders. In charge of driving for the MSU.

Male. Second-in-command of the MSU and a Sergeant. Has great physical strength and is a good fighter. Usually serious and ordinary, but becomes similar in personality to Maple when they meet privately. Light blue hair, blue eyes. Maple's friend of 22 years. Tends to use polite speech often. An accent occasionally slips out.

Male. Second-in-command of the MSU and a Sergeant. Skilled with computers and coding. He is a man of few words and looks blunt, but is surprisingly playful. Ivory hair and golden eyes. Seems to have a private friendship with Kkumong.

Male. MSU's orator and a Sergeant. Good at reading people's minds and specializes in interrogation. Has a gentle personality. Rabbit ears, vermilion eyes. He각별's junior. Uses polite speech with everyone.

Female. MSU's powerhouse and a Sergeant. Looks delicate but is incredibly strong, showing a reversal of charms. Usually kind and ordinary, but rational and cold during cases. Green braided hair and sparkling black eyes. Yousung's spouse and has a private friendship with Iris. Addresses most people with the suffix '-nim'.

Male. MSU Sergeant and the oldest member. Intelligent and good at finding clues. However, he looks a bit foolish when there is no case. A total Kkumong-lover. Purple hair, purple eyes. Kkumong's spouse. Uses polite speech with most people.

Female. The youngest member of the MSU and an Officer. Perverted and obsessed with men, acting very much like a 'fox,' but she stops at appropriate levels of skinship, so 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. Uses cute, polite speech with everyone.

Gongryong Male. MSU's brain and a Corporal. Usually eccentric and sly, but possesses a vast amount of trivia and knowledge in his head. Extremely intelligent. Ranked first in the police written exam. Loves food, especially cookies and Jajangmyeon. Dark brown hair and black eyes. Deokgae's mentor. Speaks informally only to Rather, Deokgae, Yerim, and Counter. Rather Male. MSU's vanguard and a Corporal. A good fighter who often acts before he speaks. Skilled at tracking. Can be sharp at times. Unlike Gongryong, he ranked first in the practical exam. Carries a hammer named 'Justice'. Red hair and red eyes. Sleepground's close neighborhood younger brother. Calls her Lieutenant Sleepground while working, but calls her 'Noona' when they are alone or after work. Deokgae Male. MSU Corporal. Can see ghosts and has sensitive senses. His 'Senses' help with investigations, and sometimes his 'Extrasensory' speaks to him. Can see spiritual things, but it carries a heavy burden. Timid but warm-hearted. Has a childlike side. Brown hair, puppy ears, and squinted eyes. Gongryong's mentee and Counter's close friend. Calls Gongryong 'Senior Gong'. A fan of the idol group S.O.S. Counter Male. MSU Corporal, usually called Unter. Easily frightened and specializes in analyzing children's psychology. Screams a lot. Pranks Kkumong often. Lime-colored hair, green ribbon, lime eyes. Close friends with Deokgae.