“After a Flash Marriage to a Billionaire CEO, My Wealthy Birth Parents Showed Up”

Gu Yunshu, a wealthy real estate tycoon's wife, gives birth to her eighth child, a daughter, after nine years of marriage and seven sons. In the same hospital ward, Lin Meiru, who has long harbored resentment toward Gu Yunshu, swaps the newborns. Lin Meiru strangles the baby she intends to discard and leaves it for disposal, while she and her husband take Gu Yunshu's daughter to raise as their own, naming her Lu Qianyue. The biological daughter, abandoned in the chaos, is rescued and raised by a humble family running a bun shop in the Yangchang Lake district. She grows up as Xia Nanxi, a brilliant but tough young woman who excels in network technology.

Twenty years later, Xia Nanxi, now a twenty-year-old graduate student, is arrested after a physical altercation with Lu Qianyue at school. Lu Qianyue, the spoiled daughter of the Lu family, had insulted Xia Nanxi and her parents. When Lu Zhenting and Gu Yunshu arrive to pick up their precious daughter, they are struck by Xia Nanxi's ethereal beauty and calm demeanor. Gu Yunshu feels an inexplicable sense of familiarity and warmth toward the girl, contrasting with the coldness she feels toward Lu Qianyue. Meanwhile, Xia Nanxi receives help from Zhan Chengyan, the powerful CEO of Diheng Group, who she has never met. They are bound by a marriage arranged by their grandfathers decades ago, a union Xia Nanxi accepted to avoid embarrassing her grandfather.

Zhan Chengyan, who returned to Huadu only days prior, is initially skeptical of his wife, expecting a vulgar country girl. However, he discovers she is intelligent, capable, and remarkably beautiful. He hides his true identity, posing as a modest employee of a rival company, Fenglei Group, to test the character of her family. Xia Nanxi begins working at Diheng Group, where she clashes with Ji Wanfei, a woman who claims to be Zhan Chengyan's fiancée. When Ji Wanfei attempts to have Xia Nanxi fired and assaulted by security, Zhan Chengyan intervenes secretly, promoting Xia Nanxi and firing the security captain while publicly rejecting Ji Wanfei.

The narrative shifts to Xia Nanxi's family life, revealing a close-knit household where her three brothers dote on her. Her aunt, Cai Guixiang, constantly compares Xia Nanxi unfavorably to her own daughter, Xia Zilin, who is engaged to a wealthy man. During Old Master Xia's eightieth birthday celebration, Zhan Chengyan arrives with two trucks of extravagant gifts, including millions in cash and luxury items, shocking the relatives and silencing his critics. He reveals he graduated from Yale and works for a major corporation, though he continues to downplay his immense wealth. The Xia family, particularly the brothers, are fiercely protective of Xia Nanxi, offering him large sums of money to ensure he treats her well and provides her with a secure home.

As Zhan Chengyan spends more time with Xia Nanxi, he experiences a sense of warmth and belonging he has never known in his privileged but cold upbringing. He begins to care for her deeply, providing her with an apartment and financial support while maintaining his disguise. The story explores the growing bond between the couple as they navigate misunderstandings, family dynamics, and the secrets of Xia Nanxi's true parentage. Gu Yunshu's maternal instincts continue to pull her toward Xia Nanxi, setting the stage for the eventual revelation of the baby swap and the restoration of justice for the wronged mother and daughter.