After her divorce, Lin Wan uses all her savings to open a bookstore in an unfinished building. A photograph inside an old book unravels a ten-year secret. Facing rising rent and her ex-husband's opposition, she insists on keeping it running. Her daughter Xiaoyu posts a plea online, drawing readers from all over the city to queue up to buy books. Sister Fang, Old Zhou, and Xiaokai each appear carrying their own pasts. Letter after letter reveals that Lin Wan once reported an accident and helped people claim compensation. A year later, Xiaokai publishes a book, and the people of the community gather together again because of the bookstore, while the bookstore's lights still shine bright.