I think you could like Miss Korea, it's a cosmetic company about to bankrupt that decides to root for miss Korea with the old love of the boss, who lives in a poor conservative family and has a shitty job.
Another happy ending: a divorced woman is trying to find love again and after meeting an old friend, both get super drunk and get married (that's not a spoiler, it's ep1) It's very funny, the end is a bit cheesy though.
Twelve men in a year : A journalist decides to sleep with a man of each zodiac sign in a year I loved that the topic was sex, but same in the end it was pretty cheesy, still liked it though!
Age of Youth: the characters are all in their 20s but there are mature topics as abusive relationships and they have mature humor; at some point they organise a "penis party" ^^ this scene was so funny. Very realistic one.
I loved My PS partner! I watched Red Carpet recently, it's about a porn company and expected it to be sassy and adult humor but was disapointed, it has funny scenes but is a classical rom-com, not so subversive.
But maybe in movies they are more free to put adult stuff because the audience is different?
I watched The Handmaiden and was really chocked by the sex scenes (I warn you it's raw sex and there is also some violence), I wasn't expecting it from a recent korean movie ^^
It's a thriller/drama/romance so off-topic but a really beautiful movie, One of the best I've seen in a long time, I highly recomand.