Secret (不能說的秘密)

This is a little section of the movie where the couples are playing piano.

Secret (不能說的秘密) is a movie directed by a musician Jay Chou (周杰倫) who also stars in and co-wrote the movie. The film has won several awards, including The 2007 44th Golden Horse Award, Best Visual Effects, The Outstanding Taiwanese Film of the Year, and Best Original Film Song.

The Plot:

      Ye Xianglun, a music student majoring in piano, transfers to Tamkang Secondary School. On the first day of school, he met a girl, Xiaoyu, who was playing piano in the old school building. When Xianglun told 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. However, when a mis-passed note leads to Xianglun's accidental kissing of another girl, Xiaoyu disappears for five months, only to return on graduation day and mysteriously disappear again. Xianglun discovered that Xiaoyu was actually a student from the class of 1979. His father tells Xianglun that he once taught her. She had fallen in love with Xianglun, but the only barrier is that, in the present, the first person she sees on each trip is the only person that can see her. During her absence, her story spread and everyone believed that she was crazy. After finally learning of Xiaoyu's story, Xianglun realizes that the piece that she taught him was "Secret", which had the power to take the pianist forward or backward in time depending on the tempo at which it is played. Just before the piano room is completely destroyed, Xianglun travels back to 1979.

Here's another very exciting video of the movie, where they are using piano to battle.