every Friday. Putuo District Haiyan Store is the largest and most formal chain store of tobacco sugar and liquor in Shanghai, with a bright red signboard at the door. The store has cigarettes every Friday. Putuo District, which belongs to Shanghai, is located in the northwest of Shanghai central city. It is the starting point of Shanghai-Nanjing development axis and an important land gateway and transportation hub connecting Shanghai with the Yangtze River Delta and the mainland.