When I said its a sad drama, its literally a sad drama. No one ended well. Ofc the saddest arc is the main leads. I really cried a lot.
Anyways moving on, in terms of the story, there were a few number of illogical stuffs in the story especially towards the end but all in all, I love it because
1. They resolve some issues or cases first. I never get tired of this because I find that it's the best way to build the relationship of the leads
2. Iirc they can easily solve misunderstanding. Like they won't take 5 eps just for that misunderstanding that it becomes annoying.
2. Love is very pure. Different types of love can be seen throughout e.g. selfish love, selfless love, silent love chuchu
I also like sad dramas (but not watch consecutively) because they have more impact.
For the female lead, idk but her face looks weird. Like she's pretty nmn but the face shape looks wrong. Acting not as good as ML.

Just advice if you don't like sad dramas, dont watch it.