In her past life, Sheng Zhiwei was entangled with Xie Zhu by a love parasite for a lifetime, ending in tragedy for both. After her rebirth, she is determined to fulfill Xie Zhu and her eldest sister Sheng Zhixin, taking her place in marrying the nine-thousand-year-old Pei Sun. Xie Zhu initially misunderstood her, but later seeing Sheng Zhixin's vicious true face, he woke up too late. Sheng Zhiwei and Pei Sun gradually developed feelings for each other while getting along, learning that Pei Sun had long been infatuated with her because of past letters. Finally, the two gave birth to offspring, and the family was fulfilled.