My opponent is Earthling

(This book was originally written in Chinese and translated by the author. Any translation issues are sincerely regretted.) Five hundred years ago, two Earthlings crossed sixteen light-years and came to our world. They brought vast knowledge and mighty technology, and they were like gods. We knelt before them, humbly seeking their wisdom in all things, and we sang praises of their great deeds. One hundred years ago, twenty million Earthlings came here, following in the footsteps of the gods. Following the reverence for Earthlings passed down in our legends, we once again wished to welcome these angels who had brought civilization to us. Yet this time, the angels no longer came with goodwill. They tore open the sky with silver warships and turned their cannons upon us. We do not know why the merciful gods would wish to destroy us. But it no longer matters. We are grateful for everything you have brought us, but we must still rise up and fight for the right to survive. We shall wage war upon the gods, and upon the Earthlings.