Fog Lock Tianguan

2147. Forty-seven years after the Great Silence. From 2040 to 2060, mankind experienced a global disaster called the "Great Silence" - not a war, not a plague, but all low-Earth orbit satellites lost contact overnight. Immediately afterwards, "ancient ruins" buried underground were discovered one after another around the world - super-technological artifacts that did not belong to any known civilization, including huge mecha wreckage, orbital elevator bases, and a incomplete data protocol called the "Book of Heaven." The international order collapsed. The old nation-state system was replaced by a "city-state confederation". The organization that has mastered the technology of interpreting ancient heritage has become the new core of power.