Lu Ling had just gotten an ancient book called Bell Tower. The moment he opened it, he disappeared from his seat, and only the book was left on the table.
"Welcome to the clock tower. The door is locked. Next, you need to reach the eighteenth floor, which is the top floor, before you can leave the clock tower. Each floor will transport you to a random world line. You can only enter the next floor after completing the designated tasks. I wish you good luck!"
Concept: The world is chaotic and complicated, can you still find yourself?