Hey there, I have a few recommendations for you.
For romance, there is the forever classic Kdrama Descendants Of The Sun , Crash Landing on you, or Moon Lovers: Scarlet Heart. For the Cdramas you might like Unforgettable Love, Meteor Garden, A river runs through it, or Lighter and Princess.
For thrillers I have Mouse, Bad and Crazy, or Flower of Evil. If you're not in the mood for a long series, I suggest the call or Midnight for a movie night.
You might have to do some research on these just to see if you really want to watch any of them.
Have fun watching.