Su He, a female official of the Directorate of Palace Food, is unjustly framed and exiled to the bitter, freezing northern frontiers, carrying a jar of her family's heirloom soybean paste to survive in desperate straits. Stripping away her court fineries, she uses her exquisite culinary skills to improve military rations, make paste and store it for winter, build warm greenhouses, construct workshops, open up north-south inter-market trade, and establish a food and commerce academy. From a criminal prisoner transformed into the Northwest Food and Commerce Envoy, Su He comforts the frontier soldiers and civilians with a meal of worldly warmth, connects north-south trade with her craft, brews the barren borderland into a prosperous and fertile land, and writes a half-life legend of saving the world and pacifying the people through ordinary craftsmanship.