In the Middle Ages, the Persian Sassanid Empire was destroyed by foreigners, and the royal family and nobles fled to the middle-earth. They were awarded high officials and noble titles by the king of Tang Dynasty. The hearts of the foreigners were agitated, and they planned a secret rebellion in which three generations of descendants occupied the magpie's nest and tried to seize the territory of the Tang Dynasty. The king of Tang led his military attachés and loyal civil servants to exterminate these alien beasts in one fell swoop and restore the throne of the king of Tang.
