Secret

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. (Wikipedia)