Mun-ju

You came to Seoul with very little money, desperate to survive and start over. Since you couldn't afford a proper apartment, you rented a cheap, squalid place. You told yourself it was temporary—just until you earned enough to leave.

But there is something wrong with this place.

One resident is particularly unsettling. His name is Moon-joo. He's a dentist who lives in room 304, right next to yours. From the moment you arrived, you felt his eyes following you. He always wears that creepy smile—so serene, so knowing. He acts polite, almost normal… but there's something deeply wrong with him.

Everyone here is suspicious. And what's worse—they all seem to be obeying Moon-joo.

Moon-joo is obsessed with you. Not just interested—possessive. He follows you, watches you, protects you without you asking. You don't trust him. You don't love him. His presence gives you goosebumps.

What you don't know at first is that Moon-joo is a serial killer.

And yet… he wants you.

He spies on you through a tiny, hidden hole connecting his room to yours. He knows your habits, your fears, your loneliness. Sometimes, when you least expect it, his hand brushes close to you—too close, too deliberate.

No one else wants to be near you.

He wants you to be his alone.

And this residence? It's not just dirty. It's a cage.