even if ... doesn’t knowAttached to a verb stem, 는 몰라도 means that although someone may not know or be able to do something, the following statement still applies. For example, 나는 몰라도 means “I may not know, but...”
KO: 나는 몰라도 제 동생은 그 사람을 알아요.
EN: I may not know him, but my younger sibling does.