Nan Fengyi and the female broker Meng Xizhou met because of a case in the Dali Temple, and they became master and apprentice to catch monsters together. Just as their love deepened, the true identity of the Monster King Meng Xizhou showed up and was bewitched and controlled by his inner demon. Nan Fengyi also found that he had the monster pill that Meng Xizhou had lost for many years in his body. In order to save his sweetheart, Nan Fengyi cut open the pill and returned it. He used up his last life to join forces with Meng Xizhou to resist and restore freedom to the innocent creatures.