Y from Another World

Ah! ? Where am I? Just now, I, Liu Yi, an ordinary person in the real world, was sitting on the last subway going home. When I got off the train at the station, what appeared was not the suburban road where I went home, but a dilapidated wooden house. I walked into the wooden house with a nervous heart, and found that the facilities inside the house were also very basic. When I took my first step in the house, I kicked a book. I opened it and unexpectedly discovered other secrets. What on earth brought me here? Where is this place? I will answer the questions for myself step by step.