He Xi had a bizarre dream in which an otherworldly woman used special methods to approach her fiancé, Pei Yan, and drove him into obsession. Yet the real Pei Yan only has He Xi in his heart. To uncover the origin of the dream, the two encounter a series of bizarre changes and go through multiple tests, making their bond even stronger. As the two spaces and times begin to intertwine, another Pei Yan, influenced by that woman in the dream, also slowly emerges. Destined originally to head toward obsession, he possesses an entirely different life trajectory because of the appearance of He Xi.