Guo Jie is a graduate student at a certain institute of the Chinese Academy of Sciences. She joined the laboratory for special reasons. However, since joining the laboratory, everything seems to be strange. She met her husband's comrade, separated from her husband, and suddenly discovered that she and her husband's comrade were actually husband and wife. Is this a coincidence or someone did it deliberately? Guo Jie was alone in another world to carefully verify and assassinate him many times? It seems that I am getting closer and closer to the truth, but I find that I am afraid of knowing the truth. Who is whose lover for three lifetimes?