In Haizhou in 2039, medical care, employment, and public security are all distributed by the city-level system "Yuan Nao". On the day when his mother's surgery quota was withdrawn, outsourced auditor Lu Chen suddenly saw hidden reminders behind everything: people, equipment, contracts, and medical records were all defined by lines of invisible rules. Others can only obey the system, but he can use evidence, words and behavioral trajectories to feed back the system and let the system change its judgment. From hospital scheduling to public security predictions, from employment credit to judicial trials, Lu Chen gradually opened the city's black box, investigated his father's old case, and allowed all those who had been screened out by labels to be seen again.
