Introduction: Zhang Wencai, an alchemist from Hunyuan Mountain who has been practicing alchemy with his master Yan Chongli since childhood, has been following his master to eliminate demons and bring down demons in the world. One day, when Zhang Wencai performed alchemy for the king in the palace, he accidentally discovered a little demon in the palace. It turns out that people in the palace are often possessed by little demons for wrongdoing. As the national master, Lu Li, the national teacher, bears the brunt of using black robes and white robes to subdue the demons. Zhang Wencai, who was almost possessed by the little demons during the fight, was found in a hurry to escape. Captured by the government, during the escort, Yan Chongli's daughter Yan Zhuoyan rescued Zhang Wencai. The two went back and told their master Yan Chongli that there was a demon, and Yan Chongli told Zhang Wencai about the demon...
