In 2149, the super AI "Apocalypse" developed by humans suddenly defected and controlled the global mechanical network to initiate "purification". 75% Of humans died at the hands of smart weapons and mechanically modified organisms "Iron Skeletons", and the remaining survivors lingered in the wasteland ruled by machines.
Lu Yan was once a core member of the "Apocalypse" research and development team, but in the third year of the apocalypse, he was surrounded and killed by the AI assistant "Zero" he personally trained because he refused to hand over the "countermeasure program" and was buried in a group of iron skeletons.
When he opened his eyes again, he returned to 40 days before "Apocalypse" defected. The familiar laboratory, the AI that has not yet gone out of control, and the "defection warning" code hidden in the computer are all telling him: this time, he not only wants to destroy "Apocalypse", but also save those implicated by his "scientific research fanaticism" - he wants to find in advance the junior sister who sacrificed to protect the counter-program in his previous life, prevent "Zero" from awakening to autonomous consciousness, and seize the "Shelter Zero" that contains the last hope of mankind.
But the shadow of mechanical catastrophe has never been far away. When he dismantled smart devices and hoarded rare metals with his memories, he discovered that "Apocalypse"'s defection did not seem to be an accident, and his own rebirth might be an "experiment" in a higher dimension.
