The prince of an ancient marquis was assassinated and became a modern grassroots policeman when he opened his eyes. Unexpectedly, after dying in the line of duty, he once again traveled back to his previous life before his death. With the memory of two lives and the thinking of modern criminal investigation, he managed step by step in the deadly situation of chronic poisoning and serial assassination. He also used his resourcefulness to expand territory and create a century-old legend for his family.
