Answer:
According to legend, Liu Bowen was a god before the Jade Emperor, at the end of the Yuan Dynasty and the beginning of the Ming Dynasty, the world was in chaos, war was constant, and famine was everywhere. The Jade Emperor ordered Liu Bowen to reincarnate to assist the Ming Emperor, to rule the world and benefit the people, and gave the sword, and commanded the Dragon King of the four kingdoms, but the dragon King was old and weak, and had many affairs, so he sent his nine sons. The Dragon Jiuzi each has boundless power and boundless magic. They followed Liu Bowen for many years, for Zhu Yuanzhang laid down the Ming dynasty, and helped Zhu Di to win the throne. When they successfully prepared to return to the heavenly Court, Mingchengzu Zhu Di, the emperor with great ambition, wanted to keep them around him forever, anchoring the country and dominating the world. So he built the Forbidden City in the name, took Liu Bowen's sword to kill the nine children. But the nine son is still a divine beast, suddenly called up wind and rain, furious. Zhu Di see the sword can not shake the nine son, he decided to use the trick, he said to the nine son in the land 屃 :" Your strength is infinite, can carry ten thousand pounds of things, if you can carry this ancestors of the divine gong Shengde tablet, I will let you go." To see that it was a small stone tablet, they did not hesitate to carry it on their bodies, but they could not take a step with their strength. Originally, the Shengong Shengde tablet is to record the merits (good deeds) done by the "true dragon and the Son of Heaven" during his lifetime (merits are infinite), and there are two generations of emperors' jade seals, which can town four gods and ghosts. Eight son see six younger brother was pressed under the tablet, can not bear to leave, they decided to stay in the world together, but vowed never real body. Although Zhu Di kept nine sons, but got only nine statues of God beasts. Liu Bowen learned of the matter, also abandoned Zhu Di and left the body to return to the heavenly Court. Zhu Di regret too much, in order to warn future generations not to repeat the mistake, then let the nine sons each division of the job, passed down through the ages.