I transmigrated to ancient times and became the young master of the Lin family's cloth shop in Qingzhou. Just after I woke up, the Qin family pressured my father into signing over the shop deed, intending to swallow up the Lin family business. A prolonged downpour ruined all the cloth in the city, and everyone thought the Lin family was finished. But they didn't know that in my previous life, I had worked in major-client sales and was bound to the Heavenly Craft Encyclopedia System. Using a roll of transparent waterproof film, I made the first raincoat of this era. Later, I turned raincoats into waterproof tarpaulins, cargo covers, and moisture-proof cloth. When the Qin family tried to seize our shop, I paid off the mortgage deed. When fellow merchants in the prefectural city tried to suppress me, I demonstrated my invention in the rain before everyone. When the capital's grain warehouses questioned my product, I made sure the grain sacks entered the warehouses completely dry. With this first raincoat, I expanded the Lin family's business all the way to the capital.