What the archaeological hammer knocks open is the tombstone of civilization.
Deep in the mountains of southern Guizhou, an upside-down bronze city appears, engraved with inhuman symbols. Archaeologist Chen Guanfu is the only person who can "hear" and understand its whispers, but he has also become a container slowly "rewritten" by it. Shen Zhiwei of the Seventh Contact Bureau was ordered to investigate and found that this was just a node in a cosmic-scale network. Behind it was a warning left by a long-gone "Returner" civilization - about a cold mechanism that regularly smooths out the stars: Su Zheng.
We are not alone in the universe. But most other civilizations have become tombstones.
An indescribable "extradite" appeared between the earth and the moon. Humanity did not receive a letter of war, but only received three light curtains across the starry sky and a final question. Response time: seven days. Answer criteria: Unknown. There seem to be two choices: to be "archived", or to step into the promise of "migration"...
