my recommendations:
A Man's Story revenge drama, SML is practically villain, who never redeemed himself but star of the show and very charismatic.
Giant this drama has same vibe, also revenge and anti hero-FL romance, though this anti hero is more redeemable, I think protogonists are more bad guys, I mean they do worst things, when anti hero (and bad things he does) mostly is victim of situations, misunderstandings and villain father and he was ready to be good because of FL.
P.S. I watched this drama skiping, watched only anti hero-Fl story,because it's long drama 60 ep, but their romance was worth. though they first meet in16th (+/-) episode.
Lucifer - also - SML is antihero, almost villain (actually there are other also villain-ish characters, but SML fits villain more), and FL loves him anyway. also revenge drama, it is masterpiece revenge from antihero against ML
Arthdal Chronicles AMAZING drama, multiple leads, and one of them is antihero (or villain, we don't know yet, there would be season 2) who falls for FL. this drama is kind of korean Game of thrones.
When the Devil Calls Your Name villain - Devil himself gets SFL :)))))
also western tv series:
Buffy - is classic about bad guy/villain/vampire and FL romance, it's old, more modern is "vampire diaries" where he ends up with fl abut of course kind of becomes good guy. also bad guy vampire and FL romance and very sexy romance - "True blood".
also very old but with A class Hollywood actor as evil almost devil (he is supernatural creature) character and FL romance "hex" (bbc).
and also classic/old - Smallville (basically superman story) where ML's enemy/villain falls for FL and have relationship with her.
Prasanthi SS:
I like this genre
hope you will like them