suspense drama couple facing near death situations caring/worrrying/protecting each other

Supernatural:
Grid
Possession
Tienstin Mystic (S1 and S2)
The Cursed - has a couple in it but only she is one of the main characters.
Hometown - this does not have a lot of chemistry. There is some but it ends quite quickly? Anyways its a very creepy story though
Gyeongseong Creature (still on air) - I dropped it since I found it quite stretched but it has chemistry + the apocalyptic feel you look for in regards to similar dramas "All of us are dead"

Suspebse Dramas without any supernatural occurrence:
Save me
Somebody - this is very arthouse style, meaning lots of disturbing scenes. But the story is very good and typically arthouse + couple although it's not a good type of romance
LUCA - now this one you have to stop after episode 8. It is absolutely amazingly well done. However the last 4 episodes? I don't know what happened to the production team there......maybe they were exchanged but those 4 episodes you must ignore. The story does have a satisfying ending if you stop it at episode 8 so you truly can manage to drop it after that. If you do want to continue.....you will probably regret it.