Because Shen Ningshuang, a girl from the lower class, looks exactly like the eldest princess, she is secretly sent to the Prince Consort's Mansion as a "sacred container" carrying poison. The gloomy and ruthless prince-in-law Xiao Yu regarded her as a substitute for his sweetheart, tortured her in every possible way and exploited her efforts to save the eldest princess at the critical moment. Shen Ningshuang died tragically and was reborn, returning to the night before she was sent to the mansion. In this life, she is no longer a docile lamb. She uses the memories of her previous life to make plans in advance, pretending to be a weak and bullied Cinderella, but in fact, she secretly contacts the hostile forces, tearing apart the hypocritical mask of the eldest princess with her own hands, allowing Xiao Yu to stab himself in the eyes and beg for mercy after the truth is revealed.
