With the disintegration of the Galactic Federation, the Milky Way has entered the Warring States Period with continuous disputes, and the Earth Federation is facing more and more serious challenges. The cruel war gradually made the people on Earth realize that under the law of the jungle, no one cares about the weak and wants to protect themselves. It must become stronger. Therefore, generation after generation of earth people have no hesitation, leaving their comfortable and beautiful hometowns, and immigrating to distant alien galaxies. Immigrants have established colonies in strange and barren lands, working hard day after day Work. Today, the number of immigrants living in distant galaxies has far exceeded that of the native inhabitants of the earth. Although the vast majority of immigrants and their descendants never returned to the earth, the immigrants always insist that they are earthlings . The earth is their past, present, and future, the only home.