During the prosperous era, demons and misfortunes were rampant. The court has set up a special demon hunting organization called the Demon Hunting Department, where each member must drink demon blood to fight against demons. But if one cannot achieve a calm heart, they will be devoured by demon blood and turned into half demons. At night, Pei Wende, the leader of the Anti Demon Department, led his troops to explore the inexplicable demonic aura outside the city. At the scene, it was discovered that a young girl named Bai Qingqing was actually a giant snake. While both sides were fighting, the palace was attacked by a ghost king, and the emperorLife hangs on a thread. Pei Wende was ordered to take Bai Qingqing, an insider of the Demon King, on the journey to search for the Ghost King. Along the way, Pei Wende discovered that Bai Qingqing had been threatened by the Demon King, and the two began to resolve their past grievancesSome different emotions. After facing numerous difficulties, Pei Wende finally found the hiding place of the Demon King, but the power gap between the two was clear at a glance. In the battle, Bai Qingqing died tragically to save Pei Wende by the Demon KingUnder the King's Claw...