I know it's been a while nobody posted here, but I think it's an interesting thread that people will notice in the future.
I would like to recommend KBS Drama Specials. They are not dramas, they are one-hour long films made for TV. One may like some more than the others, but they are invariably of very good quality, the themes are interesting and fresh and get you thinking: you know, the ones you don't forget after watching. The writing is not the usual k-drama clichés, the actors are top-notch (sometimes unknown names) and generally they are far from k-drama cliché.
Many of them are bitter sweet, but you won't regret watching them.
You may find the story of the Korean middle-aged farmer who got a young Vietnamese wife and how they adjust to each other, especially when the wife falls in love with the local doctor (My wife Natree's first love).
The story of a terminally ill cancer patient, a married middle-aged woman who, in the hospital, meets Lee Jong Suk and they have a sweet and poignant one-day romance (My best days).
The story of a father who poses as a nude model to make ends meet (My father is a nude model).
The story of someone who finds his past love as a rival for a coveted university position, and the moral struggle of both (Still Frame).
The story of a convict and a battered woman (a wonderful one, it's called This kind of love).
The story of someone who is told he will die but then doesn't (that one I really adored).
And other much more light-hearted ones like "Bride in sneakers".
The thing most people dislike about them is not only that some of them have a sad ending, but even more that many of them (not all) have a somewhat open ending. Most of the time it's not really open, you guess what is going to happen, but sometimes there are heated discussions on YT on what it really means.
I just love them, although I do hope that the endings were a bit clearer on some of them.
Here at viki they are bundled in anthologies, instead of being offered one by one, which makes it very difficult to promote them and also to find them by film title.
(Keep in mind that, although love is the theme, many of those are not at all romantic comedies)
Warmly recommend them. And, although they don't have explicit sexual content or anything, they are for more mature audiences in the other sense mentioned in this thread.