I saw about the tenor; Mr. Bae Jae-Cheol in a documentary in TV before.
Also, this is co-productions of South Korea and Japan.
This is really very good movie and I was tearing.
This kind of films on musicians have very good reputation often, but there are many cases the contents are not so fruitful. However, this movie was really rich the whole time.
Some songs in this movie were sung by Mr. Jae-Cheol himself, and the voice and singing were so splended and powerful!
I hope the relationship between South Korea and Japan are always very good like this actual story....
About the movie:
Motion picture of some parts:
There are lots of materials here. (The Japanese official site)
The related Japanese article.