After transmigrating into the body of Lin Xi, a peasant girl, she opens her eyes to find eight hungry younger brothers and a dilapidated house. With a magical space containing a spirit spring, unparalleled medical and poison skills, and modern knowledge, she makes cement, repairs embankments, and cultivates wasteland, rising from a poor farm girl to a wealthy landowner. But her cement formula attracts rival princes, her younger brothers become targets of a force wielding Gu poison, and even the hunter Yun, who once left without a word, turns out to be the Sixth Prince. While protecting her brothers and building the family fortune, Lin Xi develops feelings for Cang Yunzhou, yet hesitates to give him her heart because of the ancient world's rules permitting three wives and four concubines. As imperial power, the martial world, and reclusive clans become involved one after another, she must act decisively and eliminate every danger before it can take root.