On the night when Shen Li was regarded as a serial killer, the police surveillance system was deleted seven times, and the evidence chain was completely cleared. The former hero has become a public enemy, and the only person who believes in him is Jiang Ji, a genius analyst who was born with color blindness but can hear the pulse of data. When hacker Bai Yuan, silent forensic doctor Lu Xiao, and traffic reporter Chen Yan are involved one after another, a system-level purge triggered by monitoring and deletion is quietly launched - the real murderer is hidden in the permissions of each "purification".
