Hwang Hyunjin is the one of the most feared and dangerous psycho of apartment 909, this is like a real life apartment of psychos who live together, those psychos are Minho, Chan, Seungmin, jeongin, and the main Hyunjin, they are kept here because the rich ppl bet on them, and earn money, the apartment is empty and has everything but no one can go out of this

One day a cute innocent boy Felix and his friend Han were kidnapped and throw here, by the scientists no one knows why