In her past life, Shen Sangning was swapped with her stepsister and married a wastrel, while her stepsister became the prince's wife. Eventually, the prince died young, while the wastrel transformed into a war hero. Given another chance, Shen Sangning's stepsister is now set to marry the wastrel, unaware that in her previous life, Shen Sangning's efforts were what made the wastrel successful. This time, Shen Sangning is determined to bear a son before her short-lived husband dies. However, the prince is consumed with his ambitions and remains abstinent, leaving Shen Sangning to find ways to tempt him. Eventually, the prince comes to appreciate her efforts and becomes both openly and secretly affectionate, asking, "If you want a child, you'll want me too, right?" Meanwhile, her previous husband is reborn and starts pursuing her, to which Shen Sangning coldly responds, "Second Brother, please show some respect. I am your sister-in-law.