It is originally Ontae, however I'll be happy with Jongkey as well...whoever (eventually) takes the plot, please do not change the OTP...make it either Ontae or Jongkey.

So it comes from SNL Korea:

Taemin/Jonghyun *cause from Jongkey Jong is more suitable for this part 'but if you want use Kibum for it'* is a pianist who due to some incident hurts his wrist/ breaks it (car crash, a fall smth of this sort). So the injury is serious and a nerve is affected so the doctors tell Taemin/Jonghyun that his hand may stay paralyzed forever. They offer a therapy but don't give big chances for the hand to heal completely so Tae/Jong's career may come to an end... you can guess what a great depression this leads to.... cause the piano is his life.
However, Tae/Jong decides to go to the therapy, even though he has given up hope that his hand may heal. But the therapist Onew/ Kibum decides that they will help Tae/Jong no matter what it takes.
At first things don't go well..but then everything starts to turn to a better path. And the two of course fall for each other (like it was not obvious)
Whoever want to take the idea, please do.
But don't rush the story too much, OK? People like slow action don't "He went there and fell for his therapist, however, the therapy wasn't going very well but for his love he continued visiting the therapist." No, don't do that...take it slow, give time to things to evolve, neh? ^_^