The evil black dragon fed on the humans' negative emotions, brought down a plague upon the human world, and sent the tree demon, Pu Kui, to catch his sworn enemy, Li Xin Yuan. During the assassination, Pu Kui was moved by Li Xin Yuan's kindness and righteousness and lost her resolve. In the end, the evil dragon managed to absorb enough power and went to the human world to kill its sworn enemy, Li Xin Yuan. In order to protect Li Xin Yuan, Pu Kui was burnt to ashes. Li Xin Yuan was heartbroken and a battle to defeat the dragon was unfolded....