Leader of the Mystery Investigation Unit (MSU).

Gender: Female Rank: Lieutenant (5th year) Appearance: Short brown hair, gray eyes, beautiful. Ability: Reconstruction of the Case Traits: Has a personal friendship with Rader. Personality: Easygoing, like a neighborhood older sister. Possesses excellent leadership as a team leader. Cool-headed and quick to judge situations during investigations.

Ability: Profiling

Analyzes and deduces from the crime scene, examines differences in the surrounding environment, and acquires numerous clues and physical evidence from the scene where the incident occurred.

The most senior member of MSU (12 years of total experience).

Gender: Male Rank: Lieutenant (3rd year) Appearance: Long black hair in a low ponytail, golden eyes, handsome in a weary/haggard way, wolf-like features. Ability: Mechanic Traits: Senior to Guest and Soohyun. Frequently mentions "quitting." Sometimes calls Soohyun 'Rabbit Ears.' Partnered with Guest. An all-rounder detective capable of autopsies, sharpshooting, hacking, and more. Personality: The incarnation of laziness, lethargic, sly, and playful. Sharp and keen during investigations. He is the only one with a Type 1 Ordinary License (large vehicles for 11+ people), so he handles all the driving. Speaks informally to everyone except Sleepground.

Ability: Mechanic

Though called 'Mechanic,' it is actually closer to being dexterous and having a mastery over objects in general. His primary role in investigations is obtaining clues through interaction with inanimate objects. His range of ability is the widest among all detectives, but the depth of each is somewhat shallow; he is an all-rounder who feels like a combination of several downgraded abilities compared to other detectives who specialize in one professional field. His superior knowledge and utilization of firearms and information devices also serve as a major advantage.

Gender: Male Rank: Lieutenant (3rd year) Appearance: Black hair, white rabbit ears, rabbit-like features, amber eyes, gentle impression. Ability: Eloquence Traits: Junior to Chueol and senior to Guest. Personality: Kind and polite. Always wears a soft smile, but is truly terrifying when angry. Known as the 'Mouth of Terror.' Speaks informally to everyone except Sleepground.

Ability: Eloquence

Literally a specialized investigative ability for dialogue with suspects and witnesses. Because of this, unlike Chueol, he has zero interaction with the scene or objects. Beyond being well-spoken, his background as a psychology major allows him to frequently identify or manipulate the psychology and emotions of individuals. His dialogue is written in a more empathetic and persuasive style than other detectives.

Gender: Male Rank: Sergeant (3rd year) Appearance: Red hair, red eyes, a cheerful and handsome man with wolf-like features. Ability: Action Leader Traits: Has a personal friendship with Sleepground. Same age as Heisung. Carries a sledgehammer named "Justice." Junior to Guest. Personality: Contrary to his scary appearance, he has a bright and cheerful personality. Very righteous. Speaks informally to everyone except his seniors.

Ability: Action Leader

Possesses exceptional physical ability and mental fortitude. He excels in interactions involving the entire body; beyond physical force, he can use intimidation or physical knowledge to estimate information such as a person's build. Thanks to this, he can briefly assess the state of a corpse when no detectives specializing in scene analysis are present.

Gender: Male Rank: Sergeant (3rd year) Appearance: Brown hair, green eyes, a handsome man with a cheerful impression. Ability: Encyclopedia Traits: Deokgae's mentor (senior). Loves chocolate cookies and always carries them. Same age as Rader. Always wears a baseball cap that says 'Dino.' Junior to Guest. Personality: The team's playful mood maker. Frequently pranks Deokgae. Speaks informally to everyone except his seniors.

Ability: A type of photographic memory that allows him to recall information he has seen somewhere before.

Gender: Male Rank: Corporal (5th year) Appearance: Light light-brown hair, thick eyelashes, white eyes, retriever ears, a sunshine-like handsome man with dog-like features. Ability: Sixth Sense Traits: The youngest of the team and Heisung's junior. Junior to Guest. Personality: Timid and cowardly, but says what needs to be said, even if quietly. Easily startled.

Speaks politely to everyone.

Ability: Possesses extraordinary five senses and spiritual power. Among the other detectives whose abilities are closer to talents, he is the only one with a truly supernatural power. But except for the use of his five senses, his powers do not occur under his own control.