Since The Heirs is still airing, I got into another drama called You're Beautiful, with Park Shin Hye playing one of the main roles. So far I really like it. I think the drama was made back in 2009, but correct me if I'm wrong.
This is one of the songs Go Mi Nam had to sing during the drama. I found the piano version to be very nice and was able to find a copy of the sheet music online. I improvised around 30% of the song so it does not sound exactly like the original sheet music.
Hope you enjoy.
Cheers,
Henry
Sheet Music:
http://pianomusic.byethost13.com/azn.html