The Dragon King and the King of Hell complained to the Jade Emperor, who sent Taibai Jinxing to the lower world to recruit the Monkey King and invite him to heaven to serve as an official. Wukong happily went, but under the teasing of Wu Qu Xingjun, the Jade Emperor appointed him as the Horse Keeper. When Wukong realized that he was just a horseman, he returned to Huaguo Mountain in anger, hoisted a big flag, and called himself the Great Sage Equaling Heaven.