- Heroine: Su Qingyan (the legitimate daughter of a mortal general, who was frail since childhood but cared about the common people. Because her family was involved in the imperial power struggle, she was married to the ghost king to quell the rumors of "strange movements in the underworld")
- Male Protagonist: Ye Yuan (The Ghost King of the Netherworld, an ancient god who has lived for tens of thousands of years, is cold on the outside and lonely on the inside. Due to the "Netherworld Blood Contract", he must marry a pure Yin woman in the Yang world, otherwise the Netherworld will collapse)
- Background: The balance between the Dajing Dynasty in the mortal world and the Netherworld has been broken, and strange things happen frequently in both human and ghost realms. A contract needs to be concluded through the "Marriage of the Ghost King" to stabilize the three realms.
