Su Jing, a modern man, travels back in time to an ancient border town. There, local tyrants sell low-quality mineral salt filled with impurities, harming the villagers' health while driving up prices and oppressing the people. Drawing on his modern knowledge of chemistry and physics, Su Jing improves traditional salt-boiling techniques, removes harmful substances from coarse salt, and produces exceptionally pure, snow-white refined salt. Calmly facing the challenges posed by local powerful families, he exposes their evil deeds in confrontations and grows into a legitimate salt merchant trusted by the authorities and supported by the people. Thus begins an exhilarating tale of turning knowledge into the power to change one's fate.