Forced into a marriage of convenience based on mutual benefit, Jiang Yuan, an assassin from the Tai Xuan Tower, and Shao Yue, the holy maiden of the Jiu Xuan Sect, are ordered to marry. On their wedding night, they attempt an assassination, only to discover they are both immortal. To obtain the Demon-Suppressing Bell and the Demon-Controlling Bell, secret treasures of each other's sects, they transform from mortal enemies into a facade of marriage, engaging in a charade of mutual deception.