What are your guy's manhwa pet peeves?

And I don't mean or love interests being added in last minute and have 0 contributions to the story (because those are common sense), I mean something uncommon, slightly unhinged, or even curious.

For me, it's when someone claims another person and says "You're mine." Now I'm a romantic person and I totally get the sentiment, but I think booktok or some various forms of toxic literature has taught me the consequences of ownership and obsessive hypermasculinity in both straight and queer works.
Like I'm reading a fluffy BL where it checks all the boxes of a good romance and then at the end, they confess and they're like "Finally, you're mine." No form of "You're mine/I'm yours" will do me any good. It's just nonsensical to me and it's just outright strange for me to consider it the slightest bit romantic. Logically I get the sentiment. Having someone as your partner and claiming loyalty or attatchment to them is perfectly healthy and normal. But the phrase "You're mine/I'm yours" just doesn't hit right. It sounds more possessive and materialistic than romantic.

HOWEVER HOWEVER HOWEVER. No shame on you couples who say this. It's only my personal opinion because of the culture surrounding the phrase. Usually they don't end well, is what I've figured out from it, but if it works for you, I have no issues with that. It's just, manhwa that use this phrase usually just fall down a certain rabbit hole.