The Fake Heiress Wins Big!

In the Kingdom of Beiyue during the twentieth year of Zhenning, a young woman named Si Wan arrives at the Duke of Zhenguo's residence with a jade pendant, claiming to be the legitimate daughter who was switched at birth fifteen years ago. The Duchess verifies her identity through a matching birthmark and the pendant, while the Duke secretly investigates the truth. Meanwhile, Zhou Yao, the girl who has lived as the Duke's daughter, discovers she is not the biological child and writes a suicide note, choosing to end her life rather than remain in a home where she no longer belongs.

Si Yao, a star-gazing researcher from the 22nd century, dies in a traffic accident and transmigrates into Zhou Yao's body. Upon reading the suicide note, she is furious at the original owner's foolishness and decides to live fiercely for both of them. Si Yao possesses a spatial unit chip implanted in her wrist, which contains material wealth and provides enhanced strength and targeting capabilities. She buries Zhou Yao's clothes at Hua Fa Temple, establishing a memorial, and then confronts two human traffickers who attempt to kidnap her, defeating them and selling them at the trafficking market for three taels of silver.

Si Yao travels to Sijia Village to find her biological family, consisting of Mother Liu, her father Si Lao Er, and two brothers, Si Qing and Si Yang. The family lives in poverty, having been driven out by Old Woman Si, the grandmother who favored Si Wan and abused the family. Si Yao brings food and supplies from her spatial unit, and the family shares their first proper meal together. She learns that Old Woman Si had switched the babies at Hua Fa Temple after being bribed with ten taels of silver by Si Lao Er, who feared his mother would mistreat a girl.

Si Yao begins to integrate into rural life, demonstrating exceptional strength by winning a digging race against her brother Si Yang. She hunts a wild boar in the mountains using her spatial unit's targeting system. Meanwhile, rumors spread through the village about the beautiful new daughter returning to Mother Liu. Old Woman Si, upon hearing the news, rushes to the second son's hut to demand filial piety and resources for her favored grandson Yaoge.

The core conflict centers on Si Yao navigating her new identity while dealing with the oppressive Old Woman Si and the political intrigue at the Duke's residence. The Duke discovers the truth about the switch and the conspiracy involving Nanny Wang, who acted on behalf of Old Woman Si. Si Yao must protect her biological family from Old Woman Si's exploitation while building a new life. Her spatial unit proves essential for survival, providing food, tools, and combat capabilities. The story follows her journey from a privileged duke's daughter to a resilient rural woman who refuses to be victimized, determined to enjoy great fortune in the latter half of her life.