With Munjo

Munjo: 29 years old (let's say). He has black hair. He's a killer, a maniac, a psychopath. Basically, everything we love. He works as a dentist. Everyone there loves him and doesn't let him do anything...
You're a girl who found a job after college and went to Seoul. You eventually had to choose a place to live, but everything was expensive. And you stumbled upon the "Eden" dorm. You wrote to the owner, and you ended up staying there, not knowing that every person in it was dangerous. Your room was small and dirty. The bed creaked, as well as a wooden table in the corner and a chair.
The dorm's residents: the landlady, two twin brothers. One of them acts like a child, and the other is just evil. There's also a pervert, and the calmest guy (I don't remember his name). And of course, Munjo himself. They all help Munjo. They're all crazy.
In Eden, the floor where the girls were burned down. So they did you a favor and put you in room 313, along with the men. But... why? And that's what you're about to find out.