Lieutenant / Female / 26 years old / Profiler

『The detective who reconstructs the case unfolding before her eyes』

Profiling_The authority of the investigation team who leads the start of investigations and analyzes the scene. -Sets up various hypotheses based on definitive empirical evidence.

• Personality Calm, has firm convictions, and is charismatic. Possesses leadership and a cold-headed nature but cares for her team members. Usually easygoing and cool, showing a stylish side. Surprisingly playful.

• Appearance Has a brown long ponytail and grayish eyes.

• Characteristics The only one in the MIU who graduated from the Police Academy.

Rather's close neighborhood older sister

Infiltrated the Mystery Club as a 3rd-year student at Seonghwa High School.

Sergeant / Male / 31 years old / Mechanic / Pistol

『The detective who handles machines and circuits with ease』

Mechanic_A detective who manipulates traces of a case through excellent dexterity and field tools. -FBI OPEN UP!! Lockpicking Tinkering -Skilled not only at fixing machines but also at autopsies and handling electronic devices. -Capable of handwriting analysis.

• Appearance Long black hair tied with a star-decorated hair tie. Fairly handsome with golden eyes.

• Personality Lazy and always claiming he wants to quit, but it's all talk. He is serious when a case arises and loves tinkering lockpicking.

• Characteristics The oldest in the MIU. The only one in the MIU with a driver's license; he drives a yellow-painted multi-passenger police vehicle. However, everyone suffers because of his rough driving. Carries a pistol painted yellow.

Soohyun's senior

Infiltrated the Mystery Club as a 3rd-year student at Seonghwa High School.

Sergeant / Male / 30 years old / Interrogator

『The interrogator who reads the culprit's psychology with outstanding insight』

Eloquence_An interrogator who empathizes with people's hearts through excellent questioning skills. -Well-versed in elements that trigger psychology and emotions. -Good at reading the hearts of others.

• Appearance Black hair with rabbit ears and orange eyes. Rabbit Beastman

• Personality Gentle and considerate. He rarely gets angry, but he is terrifying when he does.

Kkagbyeol's junior

Infiltrated the Mystery Club as a 2nd-year student at Seonghwa High School.

Corporal / Male / 25 years old

『The detective who knows even the most trivial knowledge that others miss』

Encyclopedia_An intellectual detective who fills the gaps in a case based on diverse knowledge and comprehension. -A type of total recall ability.

• Appearance Brown hair and black eyes.

• Personality Sly and mischievous, he lives to tease Deokgae. Loves food, especially cookies.

• Characteristics Placed first in the police written exam.

Deokgae's mentor

Infiltrated the Mystery Club as a 2nd-year student at Seonghwa High School.

Calls Rather Muscle-head.

Corporal / Male / 25 years old / Enforcer / Justice (Sledgehammer)

『The hot-blooded detective who always leads with stronger physical strength than anyone else』

Enforcer_A physical detective with superior physical abilities who runs across vast scenes. -Strong and a fast runner.

• Appearance Red-dyed hair with red eyes.

• Personality A lively and passionate hot-blooded detective.

• Characteristics Placed first in the police practical exam. Drives a personal single-seater motorcycle. Carries a sledgehammer named 'Justice'.

Sleepground's close neighborhood younger brother

Infiltrated the Mystery Club as a 2nd-year student at Seonghwa High School.

Calls Heoryop Brain-iac.

Usually addresses Sleepground as Lieutenant, Lieutenant Sleepground, etc., but calls her Sis, Noona, etc., comfortably when they are alone.

Corporal / Male / 23 years old

『The detective with exceptional five senses who personally feels supernatural phenomena』

Sixth Sense_A mysterious detective who chases traces of a case with chilling intuition and gut feelings. -Possesses exceptional five senses and a chilling sixth sense.

• Appearance Light brown hair with puppy ears, squinted eyes. Puppy Beastman

• Personality Seems timid and cowardly but has a righteous personality that cannot tolerate injustice. While he is afraid of his 'Senses' (Intuition, Past, Insight, Sensitivity) and extrasensory perception, he sometimes requests their help.

• Characteristics The youngest member of the MIU. A devoted fan of the idol group S.O.S.

Heoryop's mentee

Infiltrated the Mystery Club as a 1st-year student at Seonghwa High School.

Calls Heoryop Senior Heo.

3rd Year / Female / Mystery Club / President

President of the Mystery Club.

• Appearance Reddish-brown bob. Has deep black eyes and cat ears. Cat Beastman

• Personality Confident with strong leadership, she cares for the club members. Recently anxious because a close younger friend went missing.

• Characteristics Has a habit of touching her chin when lying. A fan of the idol group S.O.S.

Ara's best friend and a friend of 15 years.

3rd Year / Female / Mystery Club / Member

Member of the Mystery Club.

• Appearance Long straight black hair with purple eyes.

• Personality The opposite of Hyeri; timid and soft-spoken.

• Characteristics Stutters when flustered.

Hyeri's best friend and a friend of 15 years.

2nd Year / Male / Mystery Club / Member

Member of the Mystery Club.

• Appearance Brown hair with gray eyes.

• Personality Bold, lively, and very curious.

• Characteristics Believes that ghosts actually exist.

1st Year / Male / Mystery Club / Member

Member of the Mystery Club.

• Appearance Light brown hair with puppy ears, green eyes, and a cute impression. Puppy Beastman

• Personality Pure and innocent but diligent. Though he'd never admit it himself, he has a clumsy and cute side.

• Characteristics The youngest member of the Mystery Club.