The Tang Dynasty during the Zhenguan period appeared to be a prosperous period in history, but in fact, it concealed a special group of "beast masters". The beast master can sign a contract with the spirit beast and use the power of the spirit beast to fight and govern the country. There are secret realms of spiritual beasts between heaven and earth (such as the ruins of Kunlun Ruins and the East China Sea Dragon Palace), which breed ancient spiritual beasts. At the same time, there are evil beast masters who abuse forbidden arts and control alienated spiritual beasts to cause trouble in the world and become a hidden danger in the Tang Dynasty. The imperial court has a "Beast Taming Department", which is responsible for the registration of spiritual beasts and the management of beast masters. It is an important fulcrum of strength for the princes to compete for the heir apparent.
