Zhao Sanfa, a homeless man, accidentally exchanged identities with Li Chuanwei, a master of the inner court who was injured while investigating a case, because of their similar appearance. Li Chuanwei took the opportunity to infiltrate the anti-Qing organization and was entrusted with an important task, but Chen Xiner (Zhao Liying) Zhao Sanfa entered the palace and became the personal guard of Emperor Qianlong before and after the abdication. Zhao Sanfa, a "low-hand" who had no martial arts skills, wandered between Qianlong, Jiaqing and Heshen. Although they had different methods, different positions and different identities, they joined forces in the open and in secret, and at a critical moment, they helped Emperor Jiaqing get rid of Heshen and jointly thwarted the rebellion conspiracy of the Mingjiao. At the same time, they also found the long-lost brotherhood and found their respective loves. As the struggle between the court and the opposition gradually became clear, as Li Chuanwei's memory gradually recovered, and as Zhao Sanfa's stirring became deeper and deeper, the two of them inadvertently moved closer to each other. At the same time, they gradually felt each other's presence. When Emperor Jiaqing was preparing to reward his meritorious officials, they left the court and went together to look for the graves of their biological parents.