In every dynasty and every generation, there is a dossier with the last page torn out. The death of the same person is recorded in the file. The murderer's page is always blank.
221 BC was the year when the Qin Dynasty unified the world. A man named "Ji" died. The cause of death, scene, and witnesses are all recorded in the book. Only the last page - the page with the murderer's name - had been chopped off with a knife.
In the same year, a man named "Guan" wrote in a history book: "In a certain month of a certain year, the death was recorded. The murderer was not recorded." Then he tore out the page.