Throughout the ancient books, there is only one historical figure named "Alien", that is, the father of Qin Shihuang, and Li Xunhuan was a flower viewer in the Ming Dynasty.
If it is not called "alien", it is that this alien is just an extraordinary person. I rummaged through ancient books at all times and all over the world, and found that there is a race called "alien" in Marvel comics.
Millions of years ago, there was a war between the two main races in the universe-the Cree and the Scrooge. For strategic needs, the Cree came to the solar system and set up a workstation on Uranus. Soon they became interested in the genetic potential of life on earth at that time, so they conducted a series of experiments on Homo sapiens at that time. Obviously, the purpose of this experiment is twofold. One is to study and prevent the possible stagnation in its own evolution, and at the same time create powerful variant fighters for the battlefield at that time. However, when they succeeded in creating a group of humanoid species with extraordinary abilities, for some reason, the Cree people gave up their experimental products.
This group-aliens, began to develop themselves in the following days, and they developed their own social system; Their isolated life gives them advanced technology beyond human beings. Through the fog of Tarrigan, they gained all kinds of superpowers.
The most description of Xiao Li's flying knife in the book is that no one knows how he shoots the knife, or just can't describe how fast his knife is. This sounds very contrary to physical common sense, so there is only one explanation. Li Xunhuan's master is an alien, and Li Xunhuan has learned super powers.