He was tied up with chains and dragged like a dog on the streets of the black market. No one knew that he was the only person who had the global emergency key before the end. Bai Xiao leads him away, just to test whether he can really restart the system; Lin Sui implants a memory chip for him, but secretly collects his brain waves; Qiqiao uses candy to pass blood to write the code; Tiehou plants broken clues in the radio. When the last reactor was started, Jiang Jin finally spoke - and Bai Xiao's blood is the key to the real world.
Jiang Jin was led by Bai Xiao through the wasteland. On the surface, he was a humanoid pet, but in fact, every step he took was recreating the encrypted path before the doomsday. Lin Sui's neural chip constantly tampered with his memory, but accidentally activated the "God's Key" fragment in his subconscious; Qiqiao's blood-coded candy became the anchor for him to reconstruct his memory, and Tiehou's broadcast code finally spelled out the true face of the "City Lockdown Plan" - it was not a defense system, but an extermination command. During the pursuit, Bai Xiao gradually discovered that his sister's death and Jiang Jin's frame-up had the same origin. Chen Xiu activated the reactor and demanded that Bai Xiao's life be sacrificed in exchange for the restart of civilization. Jiang Jin tore open the tattoo on his left arm at the last moment, revealing the complete key, but handed the activation right to Qiqiao. Bai Xiao finally understood that he was never the master, but the 'living key' set by Jiang Jin - a carefully selected fuse destined to be sacrificed. As for Qiqiao, he pressed the button lightly, not to save the world, but to hear the last song his mother sang before the end. The system starts up, the old world collapses, and the new world has not yet been named.
