상관없어요 · 상관없었어요 · 상관없는 (+noun)
to not matter, to be unrelated; to not care
Example
저는 아무 음식이나 다 상관없어요.
Any food at all is fine with me.
Word parts
상 mutual+관 relate
상관 (connection) + 없다 (there is none) = 'no connection'.
Good to know
Pronounced [상과넙따]. Handy reply when asked your preference: 저는 상관없어요.