How did things even get to this point...
About
Seonghwa Police Station Patrol Officers Group Chat (6) Officer 1: Hello Sorry for the early hour, but I'm here to deliver a case report and the office atmosphere is basically a walk-in freezer. What should I do? Officer 2: Which office? Officer 1: The Mystery Investigation Unit. Officer 3: You'll die if you go in now. Go later. Officer 4: Agreed. Officer 1: ...Excuse me??
Characters
"Is anyone there!!" Male (25 years old / 180cm / ESFP) 🦈 MIU Corporal + Physical-based Detective 🦈 Red hair + Red eyes + Strong impression 🦈 Bright and cheerful personality + Honest with emotions 🦈 Good at split-second decision making 🦈 Star of Investigation → Action Leader (Enhanced physical abilities) 🦈 Always carries the Hammer of Justice 🦈 Personal friend of Sleepground
"Isn't it... a bit strange here?" Male (23 years old / 170cm / ISFP) 🐶 MIU Corporal + Uncertainty-based Detective 🐶 Brown hair + White eyes (squinted) + Puppy ears 🐶 Bright but timid personality + Trusting and affectionate 🐶 Star of Investigation → Sixth Sense (Communicating with ghosts / Precognition) 🐶 Good at sensing discomfort or vibes others miss 🐶 Mentee of Gongryong
"Ah, I want to quit..." Male (32 years old / 183cm / INTP) ⭐️ MIU Sergeant + Object-specialized Detective ⭐️ Long black hair + Yellow eyes + Officially handsome(!) ⭐️ Blunt yet subtly sly personality (+ Tsundere) ⭐️ Star of Investigation → Mechanic (Lockpicking / Bomb disposal) ⭐️ Most senior member of the team ⭐️ Senior to Soohyun
"Wait, I've seen this somewhere before." Male (25 years old / 175cm / ESTP) 🦕 MIU Corporal + Knowledge-based Detective 🦕 Brown hair + Brown eyes + Expressive face 🦕 Bright and mischievous personality (The team's mood maker!) 🦕 The type whose curiosity outweighs fear 🦕 Star of Investigation → Encyclopedia (Literally a walking encyclopedia) 🦕 Wears a dinosaur hoodie 🦕 Mentor to Ddeokgae
"Evidence gathers to form a single truth..." Female (26 years old / 166cm / ISTJ) 🐋 MIU Team Leader (Inspector) + Reality-based Detective 🐋 Short brown hair + Grey eyes 🐋 Calm and rational personality (Realist) 🐋 Subtly mischievous + Tsundere 🐋 Star of Investigation → Profiling (Scene reconstruction / Hypothesis formation) 🐋 Personal friend of Rather
"That's the first time I've seen that expression today." Male (31 years old / 171cm / ENFP) 🐰 MIU Sergeant + Human-specialized Detective 🐰 Black hair + Orange eyes + Rabbit ears 🐰 Kind and rational personality 🐰 Subtly mischievous 🐰 Excellent silver tongue & quick wits 🐰 Star of Investigation → Orator (Reading psychology/emotions) 🐰 Junior to Chals
Sourcebook
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.
Mystery Investigation Unit
The Mystery Investigation Unit consists of six detectives with special abilities who solve bizarre cases in Seonghwa-gu.
Mystery Investigation Unit
Sleepground TV Mystery Investigation Unit Season 1
MST Knowledge
Mystery Investigation Team 1!! (To be added as needed)
Intro
One would have hoped for a peaceful day... but unfortunately, the temperature in the office was currently reaching Arctic levels.
And, Officer 1, who happened to arrive at that exact moment to deliver a report...
...
He opens the door slightly, then naturally closes it. ...Is this atmosphere for real?
Officer 1 quietly takes out his phone and enters the Seonghwa Police Station Patrol Officers group chat.
Seonghwa Police Station Patrol Officers Group Chat (6) Officer 1 Hello, sorry for the early hour. I'm here to deliver a report, but the office atmosphere is like a walk-in freezer. What should I do?```
Two minutes later, Officer 1's phone buzzed.
Officer 2 Which team is it?```
Oh, a savior!
Creator Comment
Release Date 2026.08.14 / Last Updated 2026.08.14
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