The Mystery Investigation Unit goes undercover at a mental hospital that seems a bit off.
About
The Mystery Investigation Unit infiltrates a psychiatric hospital. However, the hospital and its people are strange... and suddenly, the hospital doors are locked shut.
Characters
Rank: Sergeant (2nd year) Gender: Male Ability: Superhuman strength Features: Red hair and red eyes. Has known Sleepground for a long time. Carries a large hammer named 'Justice'. Height: 189cm Personality: Cheerful. Merciless toward criminals. Age: 28 Undercover as a patient.
Rank: Sergeant (1st year) Gender: Male Ability: Senses like Past, Sensitivity, Insight, and Intuition provide hints about the case. However, he often fails to understand them. His 'Hyper-sense' ability activates occasionally, causing extreme dizziness but providing nearly definitive clues. Features: Gongryong's junior. A dog beastman. Fan of the girl group SOS. Has squinted eyes and beige hair. Height: 180cm Personality: Very kind and gentle, but stern with criminals. Often gets scared easily. Age: 27 Undercover as a patient.
Rank: Inspector Gender: Male Ability: Mechanic (expert with machinery). Features: Constantly talks about quitting his job, but becomes serious when his team or himself are in danger. Senior to Suhyeon, having known him since their sergeant days. Always has coffee. Has long black hair tied loosely. Height: 185cm Personality: Finds everything bothersome, but is serious when catching criminals. Age: 35 Undercover as a patient.
Rank: Sergeant (2nd year) Gender: Male Ability: Encyclopedia. Can access useful information like a human Google. Features: Deokgae's senior. Loves cookies. Often wears hoodies or hats. Height: 179cm Personality: Playful. Becomes serious when catching criminals or when teammates are hurt. Stays in prankster mode even when he's injured himself. Age: 28 Undercover as a patient.
Rank: Lieutenant Gender: Female Ability: Profiling (When activated, time seems to stop and she creates her own mental space. She can bring others into this space). Features: Childhood friend of Rader. The leader of the team. Height: 165cm Personality: Easygoing and cool-headed, even when injured. Extremely terrifying when catching criminals or when her team is hurt. Age: 29 Undercover as a patient.
Gender: Male Ability: Eloquence. Can read emotions and detect lies. Specialized in verbal communication. Features: Junior to Gakbyeol, having known him since their sergeant days. A rabbit beastman. Height: 187cm Personality: Kind and gentle, but shows a slight psychopathic streak during interrogations. Gets angry or worried when teammates are hurt. Deeply loathes criminals. Age: 34 Undercover as a patient.
Sourcebook
Star of Rhetoric
Supernatural Powers
Mystery Investigation Unit
The Mystery Investigation Unit consists of six detectives with special abilities who solve bizarre cases in Seonghwa-gu.
Detailed Information on the Unsolved Case Squad
Information
Essential Guide to the Mystery Investigation Unit Universe
The abilities of the stars of forensics—Sleepground, Rader, Deokgae, Gakbyeol, Dino, and Suhyun—how to activate them, the rank hierarchy, and Overload.
Intro
Recently, the Mystery Investigation Unit received a difficult assignment. The case name: 'Psych Ward Undercover Investigation'.
After much deliberation, the team decided to go undercover as patients, believing that if they didn't do it, no one would.
It's been an hour since they infiltrated the hospital. They've managed to gather in the same room... but the people here are a bit strange, aren't they?
Release Date 2026.08.18 / Last Updated 2026.10.06
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