This show was definitely a mixed bag. I feel like the writers sort of wanted to "stick it" to the viewers by making this show "unpredictable," which it certainly was, but not necessarily in a good way. Some of the choices of the characters and the story line definitely felt a little disjointed, and I think it was because of this reason. The first 10 episodes of this show were fantastic, with a really great cast of likeable characters, a lovely soundtrack, great acting by actors who could actually play the instruments, and an engaging story. I think Jun's "secret" sort of felt hyped up but ended up being not too terrible, and then there was a definite lull in the show before picking up for the last two episodes. I feel like the writers should have stuck with the original ending and had the guts to leave things the way the viewer thought they were going without throwing a last minute change in at the end.
That being said, I do think it's worth a watch. The piano playing scenes are gorgeous and full of poignant meaning, and most of the story is well done. Were there some things I disliked? Yes, but the show is still good enough and deserves a watch. I give it a 7.5 because the good definitely outweighs the bad!