WTF!!!!!!!!!
If someone I loved pretended to be dead for 5 yrs and suddenly appeared in front of me, I wouldn't even want to look at their face.

The grief from death isn't the same as the grief from a breakup.

The writer had been playing with this since the beginning by giving the doctor a case of pills to carry everywhere. Writers should stop trying to make the audience cry. At this point they just seem like the bad teacher that hits you so you become better. This is not a healthy way of creating emotions in people.
The last few 4 or so episodes seemed like fillers with lots of throwbacks and nonsensical plot lines.
It's ok to make dramas shorter. If a story can be told better in fewer episodes, do it! It's better than spoiling a story that was good to begin with.

This idea of going through hard times alone even if you have loved ones is an Asian ideal that I can't really understand and I believe it's so damaging considering the mental health and suicide issues that are so prevalent there. Especially in South Korea. We've seen so many idols die to suicide. Pushing this idea that you have to endure hardships alone and come back to your loved ones when you're "not broken anymore" and not cause them "trouble" is something that might make this issue worse.

I can't stand by this drama anymore. The ending message is very damaging to those suffering from any sort of illness.

I'm not even going to speculate about the ending. It doesn't matter. It is what it is. And it doesn't do it for me.