Ooooo, I've been looking for some too. Heres a couple that I have watched.
More complex and less rom-commy:
- New tales of Gisaeng( 52 eps but amazing and got me into longer dramas)
- Innocent Man(makjang)
- Secret (makjang)
- The winter that blows (makjang)
- stars falling from the sky(end up becoming roomies)
- wonderful life( they hookup and have a child + get married for the child but hate each other)
- mask( arranged marriage and secret identity)
There's more so let me know if you need more recommendations.
Rom-commy ones:
- her private life
- weightlifting fairy kim bok joo
- suspicious partner
- touch your heart
- falling for innocence(her ex-boyfriend gave his heart to the new love interest)
- it's okay that's love
- coffee prince(gender bender)
- emergency couple (ex-marriage partners)
- full house
- Goong (drama with royalty in it!!!)
- marriage not dating
- my secret romance
- shining inheritance ( if you like the rich man and poor girl + roomie trope)
lmk if you need more but this should suffice. They are mostly kdramas tho.