British writer Maugham once described Chongqing in the 20th century as a city built on rocks. In 2015, Li Kecheng, the boss of the post-80s bookstore, published the photo collection of old Chongqing in the 20th century, the old city, through crowd-funding. After the publication of the book, many readers saw their former home from the old city. At the same time, the bookstore received a large number of letters from readers. They have a common theme – Chongqing memory.