This is the 5547th most frequent Korean word.
몰랐다
"Did not know."
In this sentence, '몰랐어요' is used to express a lack of awareness or knowledge about a past situation.
어제 급한 일이 생겨서 못 갔어요, 정말 몰랐어요.
I didn't know, as something urgent came up yesterday, and I couldn't go.
Here, '몰랐어요' conveys disregard or unawareness of the significance of something in the past.
이게 그렇게 중요한 일이었는지 정말 몰랐어요.
I truly didn't know that this was such an important matter.
'몰랐어요' indicates being unaware of a potential outcome or reaction before it occurred.