I generally dislike older k-dramas, but I heard good things about this show and decided to give it a shot. What a pleasant surprise!
This show has more mature themes and plot lines than almost any k drama I have ever seen, but for the most part these were handled maturely. I was particularly taken aback by how good the acting was in this - both the ML and FL were outstanding. I found the FL to be quite irritating for about the first half of the show - spoiled, temperamental, and unfair to the ML most of the time. What was really refreshing was how the ML handled the FL, I absolutely loved his "give as good as he got" attitude. He was mature but also fair in their interactions.
I also thought all the mental illnesses were handled very well! There was a lot of professionalism and realistic portrayals, so I was very impressed with that. A lot of shows (including Hollywood shows in particular) tend to portray mental illness, especially schizophrenia, as an illness that manifests as aggressive and dangerous. I really liked how they showed how most of the time these illnesses are not dangerous to other people, if anyone its to the patients themselves.
Overall this was a really enjoyable watch, I am so glad I gave it a shot!