Simple version: The attacking colonel turned into a black ape, and also hinted that the human "Atavism Plan" was a conspiracy. The clues of the follower of Liangshan were explored all the way to the 12th century outside the time void.
Serious version: The world's population has exceeded the limit of the earth's capacity, the environment has deteriorated and it is impossible to survive, and the end of the world is coming. Human beings have been searching for a new place to live to no avail, but unexpectedly discovered a time hole that allowed them to enter the 12th century, which they called the New World. However, due to the material production conditions of the new world, it cannot accommodate a population of 14 billion. Instead, implement the "Atavistic Plan". Atavism means that people undergo genetic recombination under the influence of the unstable element u and become ape-like, which is a martyr. Remaining original is what remains.
Yuan Shuyao supervises mankind's ancestral plan under the heroic mission, and is entrusted by Colonel Qianfan to find his letter of love. However, he accidentally discovered that it was his own book, and Colonel Qianho also left clues, hinting at deception and conspiracy. When Yuan Shuyao was about to ask, Colonel Qianfan had degenerated into a black ape. And Yuan Shuyao, whose Qingyan has gone through the degeneration process, decided not to be weak anymore...