Civilization Explorer

Humanity was invaded by a first-level civilization, and most of the human-inhabited areas on the earth were destroyed. Aliens hiding on the earth cooperated with the earth to attack the first-level civilization, but this was only the beginning. This first-level civilization was a planet that specifically invaded other people's planets to gain civilization. There would be subsequent attacks. If humans want to resist the attack, they can only resist the attack by continuously expanding their own civilization, and are not allowed to send people to explore alien civilizations. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.