to me, k-pop is just a music genre. i don't think it would affect my relationship at all, because it's just some sort of a hobby and i wouldn't put it over an actual person who i've decided to spend a part of my life with. it's definitely unhealthy to care about people who aren't aware of your existence more than about a person who you're with. that being said, i'm not in a relationship at this moment but if i had a girlfriend or a boyfriend i'd assume they have some hobbies and things like their favourite music genres as well, because that's normal lol and it wouldn't bother me in any way. so well, i don't think me being a k-pop fan would have an impact on my relationship if i were in one.