Yi An's background was that he was born into an ordinary family in the Song Dynasty. Because he had a strong interest in solving crimes and investigating murders, he became a disciple of Song Ci by chance.
? Details the process of Yi An learning the craftsmanship from Song Ci, including autopsy, on-site investigation, evidence collection and other aspects of knowledge. It shows Yi An's talent and diligence, and he soon grew into a skilled cop. He assisted Song Ci in solving many cases and became famous in the industry. The "An" organization was accidentally discovered in a case of the murder of an official. Yi An was hunted by members of the "An" organization. During his escape, he accidentally fell off a cliff. After traveling to the Republic of China, he discovered the existence of "An". The century-old entanglement between Yi An and the "An" organization broke out in the Republic of China.
