The story follows Li Chuan, who, while standing before an old mirror, suddenly realizes that his reflection is acting independently, even displaying an eerie smile. This strange occurrence deeply unsettles him, leading him to question his own mental state. Meanwhile, his friend Gu Wenting also notices Li Chuan’s recent unusual behavior—he’s become more confident and assertive, almost like a different person. As these strange phenomena continue to unfold, Li Chuan’s doubts grow: is he still the same person, or has he been overtaken by some mysterious force? The suspense lies in the question: who is the person in the mirror? Are these changes mere hallucinations, or is something supernatural about to be revealed?