Su Jin, an expert in clothing design and manufacturing, transmigrates to ancient times and finds herself in a poor family, enduring ridicule from the neighbors while her husband is unable to provide for them because of a leg injury. Seeing an opportunity in down, she creates lightweight, exceptionally warm winter clothes unlike anything on the market, quickly becoming the sensation of the marketplace and attracting the jealousy of fabric merchants. They monopolize raw materials, spread rumors, and produce shoddy goods to compete for military supply contracts. But Su Jin fights back with advanced degreasing and down-locking techniques and assembly-line production, completely outperforming her rivals. By delivering orders through snowstorms, she fulfills her promises, takes over the industry, and transforms her own destiny and that of the entire neighborhood.