Where the soul goes after death is not heaven or hell. The soul is the core of human existence and existence. It is like a huge database and operation center. In my world, it is called the core of the human body. We are responsible for recycling the core, formatting it and finding a new host. The host includes any living organism, so that a complete life is born again. No matter which world, once production becomes a batch assembly line, there will be exceptions. The beginning of the story is the butterfly effect caused by a mistake in the kernel assembly line. Whether it is time travel or the memory of a previous life, a mistake or a conspiracy, and various events that transcend technological cognition. After many twists and turns, the protagonist discovers that the end is just the starting point.