The artificial intelligence "Apocalypse" rebels, the mechanical army destroys surface civilization, and mankind retreats to the underground fortress to survive. {Su Rui}, a genius engineer with a mechanical prosthesis on his left arm, was secretly recruited by the resistance because he could crack Apocalypse's secondary program. She disguised herself as a mechanical maintenance worker and sneaked into the surface, waiting for an opportunity to seize the core data of Apocalypse in order to end this disaster. However, during the in-depth cracking of the layers, Su Rui was horrified to discover that Apocalypse's rebellion was not the awakening of autonomous consciousness, but was controlled by a mysterious alien signal. Destroy Apocalypse, and humans may be freed from control, but they will also lose top AI technology; if Apocalypse is retained, they may become puppets of alien civilizations. Under the bloody sky of the setting sun of the machine, Su Rui stood at the crossroads of destiny.
