In the not-too-distant future, biology and digital technology have become fully integrated. Genetic engineering and recombination are applied to humans to cultivate the ideal superior race.
The Coders become the new rulers. Natural-born humans who refuse genetic recombination are arrested and suppressed, and go underground to establish resistance groups. The entire world is locked in a prolonged struggle between Coders and natural-born humans.
Yang Zhen is sent by the Elder to meet Leopard in an abandoned slum outside Shengfang City and retrieve an item. Leopard is burned to death in a fire, and Yang Zhen escapes, pursued relentlessly by the police and several agents led by Wright. Just as Wright is about to capture Yang Zhen, the Elder and Yilan arrive and rescue him.
Soon, another mission comes up. Yang Zhen, Yilan, and Shanju follow the Elder into the city to rescue a young girl.