In 2491 AD, the year 233 of the Human Federation, humans have not yet flown out of the solar system, but they have already achieved immortality.

Mature human individuals modify their own genes and are known as acquired reincarnations; And for those who transfer their thinking to the prosthetic brain, log in to the artificial shore and live in the virtual world, they are called celestials.

The early Acquired Reincarnation and the Celestials had a conflict of needs, and therefore went to war. Most of the acquired reincarnated after the defeat were exiled to Mars to become demons, while the acquired reincarnated ones who remained on Earth co-designed new humans with the celestials and the old humans.

The first generation of new humans is called congenital reincarnation, and the vast majority of traits are inherited from their parents, with an average lifespan of 800. After the decay of the physical body, it can be reincarnated into an artificial shore floating in space, and continue life in the virtual world.

All new humans, old humans, demon races, and animals with higher thinking can be reincarnated into celestial beings, and now there are more than 30 billion celestial beings registered on each artificial side, of which the largest six artificial shores are called the Six Desire Heavens.

There are 2.6 billion new humans, including the reincarnated, and less than 170,000 old humans, who have given up their immortality for religious beliefs in order to liberate their souls, and the new humans have the responsibility of preserving the heavens.

New humans are divided into many subspecies, which are reproductively isolated from each other, and the reproduction of offspring between different subspecies requires approval and the use of technology.

Due to the interference of the early acquired reincarnations, some of the technology was cut off for a while, and research was resumed more than 200 years ago.

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For detailed background, please refer to the "Historical Background" article related to the work.

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