Ye Xianglun, a music student majoring in piano, transfers to Tamkang (Danjiang) Secondary School. It is a school famous for musically talented students, especially for those who play 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, 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 of the demolition of the piano building on graduation day, she teaches him the song that he heard on the first day of school.-http://en.wikipedia.org/wiki/Secret_%282007_film%29