Immortal Emperor Ling Xuan was betrayed by his beloved disciple Chi Night when he was going through a tribulation. After his death, his soul passed through the body of a down-and-out security guard in the modern city. In order to restore his cultivation and track down the traitors, he concealed his identity and joined the museum, but unexpectedly discovered that the seemingly ordinary administrator Su Li could see his dissipated fairy spirit. Su Lishi is the last descendant of the ancient Taoist "Hidden Sect" and was ordered by his master to suppress an ancient evil object in the museum. Due to the strange movements of evil objects, the two were bound by the ancestral teachings of the "Hidden Sect" to become a fake couple to guard together. In the early days, they were testing each other and guarding against each other. Ling Xuan believed that Su Li was a mortal and needed protection, while Su Li secretly used magic to resolve many crises for him but pretended not to know. Red Nightmare has been reincarnated as the heir of a modern conglomerate, and is secretly collecting evil fragments in order to resurrect the ancient demon. As the crisis escalates, Ling Xuan gradually discovers the shocking secrets and power of his wife, and Su Li also sees through her husband's extraordinary origins. The two went from concealing each other to frank cooperation. Ling Xuan taught Su Li the immortal method to help Su Li unleash his potential. Su Li used Xuanmen secrets to reshape Ling Xuan's immortal base. In the process of disguising his identity to fight against the Red Nightmare forces again and again, Ling Xuan gradually learned the love and responsibility of mortals from the arrogant immortal emperor, while Su Li grew from a lonely executor burdened with fate to a strong man who can slay demons alongside her husband. In the end, they foiled Red Nightmare's conspiracy to destroy the world, and Ling Xuan and Su Li went to the immortal road together. This marriage, which began with deception, became an endless bond of cause and effect.
