Did the dad found Xianglun dead body in the demolished building? I told him, his dad probably just found one drop of blood on piano key.
My son was confused as he is now just 10 yrs old, he thought that in the story the main actor and actress can travel anytime and anywhere with any piano.
Anyway it's quite a genius time travelling story using the the speed of playing on one music piece to determine the voyage year where he/she traveled.
And it make sense on how first person can only sees her on each several times travelling.
How the sweat and blood made them permanently stays at one time space.
I have to watched it back again because I saw the news of Korea going to remake this and also I was screen viewing on the whole movie to find the older version of Xiaoyu at the back scene, she was alive until the younger ver. past away and both ver. diminished forever.
In other words the Xiaoyu version that Xianglun in luv with was already dead.
And I also think that Xiaoyu was always in a loop of travelling in timeline hystory. Can't explain why I think that way.

But I would like to add my own story version which are
The tear- erases memory
The blood - will make the piano player visible to everyone when they reached their destination.
Next i want to add is the music. Ahh the theme song was so catchy aswell as the rearrange final scene version piano cover (Super Secret by someone i didnt know his name)

The Korean movie version has yet to come out but I know its going to be decent at some point. Most of the time the original piece will engrave deeply in viewers heart.
Just like how Korean Queen Inhyun's Man, I preferred the Korean version if compare to the China remake version.

This movie deserved all the awards they won. And Jay Chou involvement in directing of this movie, he casted on it, the music he created in this gave more sentimental view on it. He is really a remarkable musician.