Similar vibes I would bet on the beast must die and unchanged man.
The beast must die writing is incredible since it centers more on character writing, the romance is done well but not what would expect since the one of the characters is psychopath so he cannot experience love. Their dynamic is top-tier and realistic (heavy on this word)
Unchanged man, I would say, is a heavy read about two unreliable narrators. I gotta warn u there is non con, rape, etc. involving the protagonists if ur sensitive.
If u want the classic ks, I suggest just search
Hwang Young's Misery
+ on the site about locking ukes etc.
yuwon everlasting and emotion, same author >~<
no reason
reverse thinking
non zero sum
falling sheep
Corrosive
can someone tell me best DARK manhwa like Killing stalking....i already read - black mirror , obey me , wherehouse ,