Tianluo City, the last giant city in the wasteland, is an invisible court made up of the system of nine classes of people, the five major families, assassinations and marriages. Shen Du is an abandoned son of the Shen family, who makes a living by scavenging in the fog-shrouded slums. He has an ability that no one knows about: rehearsing the future while sleeping, at the cost of his memories being peeled off. Canguang Society took him in as a low-level spy. On his first mission, he carried a dying warrior back from the radiation ruins. After the man woke up, he only left one sentence: "I owe you my life. The cause and effect has been fulfilled. What do you want?" Shen Du realized that in this city, saving people meant incurring debts - the creditor had the right to ask for anything, and if he refused, his Qi pulse would be exhausted. The scenes in the dream become more and more bloody: the family uses him as a knife to cleanse dissidents, his companions are forced to become traitors, and he must use the rehearsed memory to turn every step into a comeback before the cause and effect collapses. But the victor loses his relatives - this curse follows him everywhere, and every decisive victory means the death or breakup of a certain relationship. Is Shen Du's knife saving people or killing people?
