San Francisco, 1980. As 72-year-old Guo Xue Hu reminisces about his hometown, Dadaocheng, a young man walks towards him from afar. It is Xing Xiong, Yi An's son. He has brought a letter from Yi An, a letter addressed to him. He learns that Yi An had already passed away last year. Xue Hu tells Xing Xiong about the 1920s, when he met his father, Yi An. Through Xue Hu's words, Xing Xiong pictures his father as a young man and gets to know him better. The memories of Yi An and Ru Yue's tortuous love and all the scenes of joy and sorrow during those turbulent times keep coming back to Xue Hu-that era, those people. The things that happened are things he will never forget.