The Sman is a descendant of the Earth's humanity, but their generation has no memory of the earth, just like how we left Africa for our ancestors. Earth, for them, it is just a little planet of more than 30 million years ago, there will be no emotional bond. Earth descendants like Sman are scattered in every comner of the universe, and even do not know each other's existence. After so many years of evolution, some of the descendants of the earth have already appeared in the shape of new features, it is diffcult to use humans again. The noun to describe them. The Sman family is not far away from the Earth, and it is more than 1,500 light years. They are the descendants of the earth closest to humanity.