The mountains of southern Yunnan stack up to the horizon, and the Three Treasures Pagoda stands guard in the folds of the mountains. Two thousand miles to the east, Purple Mountain guards the city of Nanjing. Yun Kun came out of the mountains and studied optics, hoping to see further. Ningxiang's household registration was changed, and her life took a turn. The two met at the foot of Purple Mountain. He is stubborn and she is tough. When he was poor, he raised chickens in the backyard and planted melons on the walls. He used leftover materials to make a kaleidoscope, which blossomed when the light shined on it. Later I had children. The Three Pagodas are still the Three Pagodas, and the Purple Mountain is still the Purple Mountain. People from the mountains moved out, and houses in the city were demolished. Food stamps, household registration books, queues for meat, proof of a broken leg, and swallowed grievances - these are all the paths that this generation has traveled.