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Chen Du, a maintenance worker in the lower city, has an "ability": he can enter a brief "moment of clarity" under the suppression of a nerve inhibitory field. When he woke up, he saw the skeleton of the world-- Four hundred years ago, human beings built upper and lower cities out of selfishness. Humanity introduces AI due to chaos. AI erases humanity due to efficiency. The system eliminates humans due to perfection. No villains, no plots, just math. The seven tones he heard in his tinnitus were the last codes before civilization retreated. A group of people who are destined to be eliminated, caught in the cracks of an absolutely rational system, refuse to reproduce to confirm that they are still human. This is a silent extinction. And he was the last recipient.