Picked up a Street Book

Cheng Lu picked up a book on the Internet. What? Does this book record your own world? What? I'm not the protagonist? What? Is it because the protagonist's system causes fantasy creatures from all over the world to invade reality? What? The content of this book can actually be modified? As a salty fish, in this era where fantasy invades reality, Cheng Lu just wants to collect fantasy creatures while silently watching the protagonist show off.