Both deal with very important topics such as illness and mental health.
The one that I recommend to you in particular, I met him through a video on YouTube of one of the secondary couples (one of them played Lee Sung-Kyung) and not only are they but in general, all the characters and especially the protagonist they have a great development and they manage to overcome their problems.
He was the first in Korea to talk about these issues, as far as I know.