Delivery boy Chen Zhuo killed the world's top hacker on a rainy night using his intuition alone, and the live broadcast shocked the entire network. He didn't know that he had been an agent that had been erased, and he didn't know that the taciturn hacker leader Lin Xiao was staring at the 'Final Key' in his mind. When the AI girl Bailu whispered in the helmet, "Your sister's life, in exchange for my freedom," and when the risk control supervisor Su Tang secretly deleted his criminal record in the system, Chen Zhuo discovered that what he was delivering was not takeout, but the last firewall of human civilization.