In 20** AD, mankind launched the devastating Third World War for resources, land and their own ambitions. The war lasted for ten years. After the war, natural disasters continued, and the human population was reduced to less than 2 billion.
200 Years later, a new world structure was born. Humanity abandoned war and began to develop science and technology. New glory came again.
But with the invasion of unknown aliens and the discovery of new civilizations, humans have realized how insignificant humans are in the vast universe, and humans who think they are the masters of all things have come to understand the reality.
Concept: Infinite flow, using the character's first perspective to enter and participate in legendary events, mythical events, etc.