The princess was fed contraceptive soup on the day of the marriage exchange, and she went crazy

Upon opening her eyes, Sheng Nanzhi discovered she was actually with her brother-in-law from her past life. When she heard her younger sister clamoring to break off her engagement with the powerful Sixth Prince and marry her impoverished scholar-fiancé, Sheng Nanzhi realized she had also been reborn. Her younger sister wanted her husband, ostensibly a poor scholar but actually the emperor's illegitimate son, and she wanted him. In her previous life, she schemed to help that clueless scholar ascend to power, only to be abandoned. In this life, she didn't mind living a happy life as a widow. But how could the man, who was supposed to have died before their marriage, still be alive and well? And alive...