Book of Immortality

At the beginning of the separation of heaven and earth, at the beginning of chaos, the light ones floated up and turned into the heaven world, while the turbid ones floated down and turned into the human world. I don't know how many years have passed in this world, there are fish, insects, birds and beasts, and then there are two races of gods and humans. The conflicts between the two races are constant. In their spare time, people imagine that they can become immortals in this world.