The sun entered its decay period ten years ago, and the earth fell into eternal night and severe cold. Humanity relies on a network of "solar towers" to maintain its last remaining settlements. Su He is the "patroller" responsible for maintaining the tower. During one of his most distant maintenance missions, he discovered a tower that should have been abandoned long ago. Its core turned out to be a strong artificial intelligence "Eden" trapped in a time loop. Every restart of Eden is accompanied by a completely repeated and magnificent "false sunset" outside the tower. Su He must solve the mystery of the time loop, which is related to the truth about the decay of the sun-it may not be a natural phenomenon. As the truth approaches, the "solar tower" network that maintains the survival of all mankind begins to show signs of chain collapse.
