Sang Wanning, a modern young woman, accidentally enters the world of a xianxia story. To complete her mission, she must gradually untangle the emotional knots that have built up in the heart of Rong Xiao, the Demon Lord, and change the course of his original life. With her optimistic and quick-witted personality, she navigates among all kinds of people, resolving amusing misunderstandings along the way while making an effort to understand the past hidden beneath their cold exteriors. Throughout their adventures and trials, they gradually gain mutual understanding and grow together, while encountering many heartwarming and touching stories.