In Chang'an, headed by the capital of the Tang Dynasty, there has been peace from generation to generation. However, cases arising from personal vendettas have caused unrest in the court and panic among the people. After discussion by the court, Shuzhu, who came from an official family, was appointed as a criminal officer by the king, along with his assistant Xu Nuo'an, Shi Shi of the bodyguard, and Qiao Zhiyuan, the daughter of a famous medical expert. Pet Baozi forms an investigation team and solves the mysteries one by one. Guard Chang'an
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