도 모르는

who doesn’t even know

→ 도
phrase Rare #18,853
who doesn’t even know 도 adds emphasis, often meaning “even” or “not even.” The phrase follows what someone doesn’t know; the examples use it in critical or insulting expressions.
KO: 그 사람은 길도 모르는 것 같아요.
EN: That person seems not to even know the way.