Eighteen years ago, a disaster swept across the palace. Taoist doctor Lin Xiao was ordered to relieve his suffering and save the people. Unexpectedly, eighteen years later, the terrifying mysterious virus attacked again, and Lin Xiao and his two apprentices Tian Xiaoxie and Dazhuang looked for a solution. After several fierce battles with the corpse, Tian Xiaoxie discovered the mystery of his life experience and was involved in a shocking conspiracy. Seeing that the world is about to turn into purgatory, the virus in Tian Xiaoxie's body is also activated. Are Tian Xiaoxie, who is about to turn 18 years old, becoming a human or a demon? Good and evil are only in one thought.