The Xie family, an ancient family well-known in the world, possesses a secret book that everyone wants to know. The master of Anle Valley, who is known for disguising himself and making poisons, sends his disciple Jiufang Yuan to disguise himself and sneak into the Xie family. After a long period of experience, he finally gains the trust of the Xie family. In the process, he meets the most important man in his life, the youngest son of the Xie family, Xie Changfeng. Unexpectedly, the master suddenly came to get the secret book and was injured by the Xie family. Jiufang Yuan was the master's protector and exposed his identity. He was seriously injured by Xie Changfeng himself and barely escaped. He has been in hiding since then. But even so, it is often heard that Xie Changfeng places bounties on him year after year. Jiufang Yuan has to keep changing masks and identities, thinking that he can escape for a lifetime, but he still cannot resist fate. One day many years later, they meet again...