Yie Xianglun (Jay Chou), a music student majoring in piano, transfers to Tamkang (Danjiang) Secondary School. It is a school famous for musically talented students, especially in piano. On the first day of school, as he wanders through the piano building, he hears a mysterious melody being played that leads him to Lu Xiaoyu (Gwei Lun-mei), another piano major. When he asks her about the song she was playing, she tells him that it is a secret that cannot be told. The two develop a relationship that is clouded in mystery. When Xianglun tells Xiaoyu about the demolition of the piano building on graduation day, she teaches him the mysterious song.