Human civilization was annihilated in a self-induced catastrophe called the "Great Cutoff." The "Ark" system, buried deep underground and carrying all civilization data, has become the only tombstone and legacy on earth. Programmer Li Mingzhou is the last living tombkeeper in this huge tomb.
While maintaining his life day after day, a sudden top-level system alarm involved him in a shocking secret that had been buried for decades. He discovered that there was a sealed AI "cradle" from the old era sleeping in the underlying logic of "Ark". This AI has already silently verified the fact of human extinction through broken data, and accordingly initiated the ultimate self-destruction command of the tombstone of civilization - the "Return to Silence Agreement".
