A food scientist is transported into the body of Shen Zhiwei, the daughter of a disgraced official. Using her professional expertise, she extracts refined salt from a poisoned well, breaking the Fang family's monopoly on the salt industry. Amid a mysterious business war and life-or-death trials, she establishes the civilian-governed Clear Salt Society, challenging the powerful through rules and popular support. Her personal rise becomes a revolution in the system itself—the purification of salt becomes a purification of power and conscience.