On the day he lost his job, Lin Xu picked up a blue-gray robotic cat in the trash can. It said: "I can give you magical props, but each prop has rules." Space door: It can only lead to the place you have been. If another self appears in the door, please close it immediately. Memory Bread: Eat it to remember knowledge, but if a human face appears on the bread, spit it out immediately. Lin Xu thought it was a cheat until he saw another version of himself smiling at him in the mirror. Rules are used to kill people. And he seemed to have become the prey of the rules.