Hello!
There are lots of songs that I’d like to play, but finding the website with good sheets is not an easy task!
Anyone knows a good website (for Kpop songs, China songs, jazz songs, waltz songs)?
I’ve just discovered this one (not free) but I don’t think I’d found Kpop:
https://www.musicnotes.com/pro
The music I want to play is “Once Upon December”. Beautiful.
https://www.youtube.com/watch?v=bs2VL_HYG9Y
Lovely song 
This song “Mariage d’amour” is good, too:
https://www.youtube.com/watch?v=FoCG-WNsZio
This version is from a famous Japanese prodigy blind pianist:
https://youtu.be/r5hZEtB7qdg
Cello version is the best:
Jacques Offenbach - Opera Barcarolle - La Vita è Bella - Life Is Beatiful - La Vida Es Bella
Great Classics 
Do you know this one, it is faster, but I really like it though:
In case you want to look for the song it is called: Phil Coulter - Coultergeist
I post the title now since I don’t know which video is banned for you.
I listened to it, liked the version with only piano. Really beautiful, thanks for sharing.
The one I’m listening to:
https://www.youtube.com/watch?v=QTMjtEcQHls
English lyrics (thanks to the subber):
The smile that trembles deep behind your tears
Is the promise of the world since the beginning of time
Even if I’m alone now, from our yesterdays
Today is born sparkling
Like the day when we first met
You’re not in my memories
You turn into a breeze and touch my cheeks
Even after our parting in the afternoon with the sun beaming through the trees
The promise of the world won’t ever end
Even if I’m alone now, tomorrow is limitless
You taught me about
The kindness that lurks in the night
You’re not in my memories
So live forever in the song of the streams
In the color of this sky, in the fragrance of flowers
The piano cover:
The song is nice, also the movie.
I should watch some anime again. Used to watch a lot in the past and some had great music.