The heart is quite the curious ... well muscle or organ or whatever you want to call it (I think medically speaking it is closer to a muscle). If broken it is almost impossible to fix. Although who knows what can be done in the future. Right now we have replacement operations and all that. But this is about a deeper issue, about how we live life - about trying to be a better self, no matter our background.
Now this does sound like this might have quite a few cliches ... and it does start quite badly to be honest. I had a hard time to find something to like - it seemed quite forced upon the viewer. But our "ill" character here lightens the mood enough - all the while he has some outbreaks. But outbreaks that make sense. He is young, he doesn't know better. And than the bonding starts ... with some really good dialog - and some heartwarming scenes - no pun intended.
Yes it is quite predictable in where it will go - but it has its heart on its sleave ... ok enough heart puns. But trust me when I tell you, because I tend to be a bit critical when it comes to german dramas of this kind: this actually hits its mark, after a troubled beginning! So don't turn off at first if you feel the same way ... give it a chance.