Secret (2007)

Ye Xiang Lun is a music student majoring in piano who just transferred to Tamkang, a school famous for its musically-talented students, especially those who play piano. On his first day of school, he hears a mysterious melody being played; following it, he meets Lu Xiao Yu, 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 form a friendship that quickly evolves into a romantic relationship. However, there is more to Xiao Yu than initially meets the eye of Ye Xiang Lun.