In the summer of 1995, in the beautiful music town of Gulangyu, 18-year-old Luo Yu committed suicide due to severe depression. This plunged his parents and friends Xiaoke and Momo into infinite grief. When his parents were cleaning out his belongings, they discovered Luo Yu's will and a hundred unsent letters. This seems to solve the long-standing mystery, but makes the secret more and more complicated...
In the summer of 2005, Wu Xia, a 28-year-old well-known magazine editor in Beijing, broke up with her boyfriend of 10 years. She went to Gulangyu alone to participate in a literary and poetry festival called "Summer of Wind", where she met Kevin, a literary youth of the same age studying in the United States. In the romantic and melancholy summer of Gulangyu Island, stories that have been sealed for a long time gradually become clear...