Li Jin completely lost his memory after a car accident. The only thing engraved in his bones were the seven names written in blood - the list of murderers that he personally wrote down. The police determined that he was the victim of a serial murder, but only Xie Yao knew that Li Jin was an avenger who personally killed seven criminals. When memories poured out like an hourglass, Xie Yao chose to conceal the truth and approached step by step as a lawyer, just to find out whether the fire that year really killed all the witnesses. The two are entangled in the fog, one is the forgotten avenger, and the other is the secret keeper who knows everything but dare not say anything.