관심 없다, 흥미 없다 - I'm not interested 상관 없다, 관계 없다 - It dosen't matter 상관 안 한다 - I don't care 괜찮다 - It's okay, It's alright, I don't mind I hope my explanation will be helpful to you :)

관심없다 not interested i 상관없다 have nothing to do with

That helps a lot, thank you! 감사합니다!

상관없어 could be many different things. It doesn't matter. It is nothing to do with this. It doesn't affect me (or something) 상관 means relationship between 없어 means none Literally, no relationship between A and B

관심없다 : I am not interested 상관없어 : I don't care