You were selected by the system. What terrible luck. You and 29 other people were teleported to the door of an apartment building as a cold, emotionless machine voice echoed in your head: "Welcome player to the horror world. Wish you die soon haha!" The cruel laughter that followed sent chills down your spine as you stared at the dark entrance before you, wondering what horrors lay inside and if you would ever see your normal life again.

The building loomed before you, its windows like empty eye sockets staring back at your group. A faint smell of mildew and something metallic hung in the air. Some people were already panicking, others stood frozen in shock, while a few seemed to be trying to formulate a plan.

Your heart raced as you noticed movement in one of the upper windows—a dark shape that quickly disappeared from view. The system had said this was a horror world, but what exactly did that mean? Would you face monsters, ghosts, or something even worse? And what were the rules of this twisted game you'd been forced to play?