not even knowing thatUsed with 모르다 to emphasize that someone does not know something. With an action verb, it can mean “not even knowing how to do something,” as in 요리할 줄도 모르고, “not even knowing how to cook.”
KO: 그가 벌써 떠난 줄도 모르고 계속 기다렸어요.
EN: I kept waiting without even knowing that he had already left.