Palace. Xigong is one of the palaces in Luoyang. Historically, it was the palace of Li Siyuan's succession, the Hall of Supreme Harmony in the later Tang Dynasty, and it was a very important palace. The bad guys are the schools in the domestic animation "Painting Rivers and Lakes" series. The prototype is a faint official in the Tang Dynasty in history. A secret department of the Tang government, similar to the Royal Guards of the Ming Dynasty, was only responsible to the emperor.