In 2087, due to the accelerated expansion of the universe due to the Big Bang, the Earth was instantly swallowed by a black hole that was originally tens of billions of light-years away. No one knows what the world will look like after being swallowed. Hundreds of millions of years later, an unexplainable life phenomenon occurred in the universe, giving rise to a brand-new life form with a strong learning ability. Soon they learned about human existence and human civilization from the traces left by humans, so they called themselves Zero to commemorate their uniqueness. They are the first life form after the disappearance of human beings, and they may also be the last. Zero is a very strange life form. They have unlimited energy and can achieve perpetual motion that was denied in human civilization. However, at the same time, Zero is a life form that is very sensitive to temperature. Once its own temperature is out of balance, its structural strength will slowly lose its ability to recover, and even eventually begin to gradually disintegrate. These life forms gradually evolved and developed in the universe by learning from the many human civilizations left behind by the human world.