Newly married Shen Du and Lin Qi encounter a weak evil spirit on a rainy night, and Shen Du becomes possessed. The evil spirit Xuan Yan was originally a Taoist Celestial Master thousands of years ago, but his soul is still wandering today due to misunderstanding. Although Lin Qi has a meager Taoist bloodline, he cannot drive away Xuan Yan, who is deeply integrated with her husband.
From hostility to coexistence, the three of them gradually pieced together the truth about a thousand years ago while evading pursuit and retrieving Xuan Yan's old belongings. Shen Du's harmony, Lin Qi's persistence, and Xuan Yan's arrogance all work together in life and death tests.
