I have watched the movie long ago, its not an English movie, it's a love story, the boy is good in playing piano, only that boy can see the girl and in the end they were found to be lived in different generation.
( somehow I remember the title of the movie contain "secret" or m not so sure) some body please help me. Thanks

Secret? (https://en.wikipedia.org/wiki/Secret_%282007_film%29)