When I woke up, the world was empty. The signal is interrupted, the city is dead, the automatically operating supermarkets, and the constantly looping surveillance images are like carefully laid traps, waiting for his appearance. Lin Ce, an ordinary engineer, woke up at the end of the world, only to find that he was like a "selected" survivor. Who is hiding in the city? Why does time stand still? Who left the string of memories in his mind that did not belong to him? In an isolated city numbered "Zero", he must decipher the illusion and uncover layers of truth in order to escape from this doomed "experiment"... But the closer he gets to the truth, the more he suspects that the one who is truly trapped may not be the city, but himself.