Lao Zhang, a veteran master of Zhang's Winery, sticks to the old rules of brewing pure grain on the spot at 18 yuan per jin, never diluting a single jin. After being expelled from the sect, his apprentice Xiao Cheng opens Cheng's Wine Warehouse right across the street, selling blended wine at 12 yuan per jin, dumping at low prices, and offering free side dishes for drinks. He snatches up large banquet orders and colludes with Manager Hao to drive Lao Zhang out of the street. Although enjoying a brief period of glory, Xiao Cheng suffers month after month of losses and resorts to desperate measures by bringing in inferior alcohol, leading to neighbors being hospitalized one after another. Lao Zhang's pure grain wine quietly opens at the old stage in the south of the city, ultimately returning to the old street to establish three ironclad rules, with the entire street lining up for nothing less than a bowl of clean wine.