Shangguan Yu was the deposed prince and was exiled to the frontier. He got a scale-reverse book and developed peerless martial arts. He launched an army to take revenge and conquered three states. When the troops came to the city, the emperor took out the imperial edict of passing the throne. It turned out that the emperor was not a usurper, and the late emperor had left an imperial edict for him to succeed to the throne. Shangguan Yu didn't believe it, so the former emperor's former minister told the truth: his mother was the daughter of a traitorous general, and the late emperor was afraid that he would be manipulated by his relatives after he succeeded, so he passed the throne to his younger brother. Shangguan Yu fell into confusion and finally put down his sword.
