Lin Luyou, daughter of Suzhou's richest man, is set to marry Zhao Lingheng. Niannian, the little fox spirit embodying her mother's lingering obsession, helps her see her fiancé's true nature: gentle and refined in public, but a ruthless killer in private who plots to seize the Lin family's business. She flees her wedding in the middle of the night and encounters Shen Jizhou, a surviving descendant of the former dynasty. After breaking off the engagement, she establishes 'Luyou Next-Day Delivery' and uses preorders and grid-based distribution to break through trade route blockades and expand into the capital, becoming embroiled in a power struggle between the Crown Prince and the Chancellor. Following the Double Ninth Palace Coup, the Sixth Princess ascends the throne. Lin Luyou offers the gunpowder blueprints left by her mother, only to provoke the emperor's murderous intent. Niannian exhausts her energy to send her back to the modern era, where she reunites with her mother, who had been presumed dead for fifteen years. Believing Lin Luyou is dead, Shen Jizhou vows to kill the emperor to avenge her.