Indicates that you did not expect or know that something would happen.
When to use
explaining unexpected situations, expressing surprise, sharing new information
The nuance
Attach -(으)ㄹ 줄 몰랐어요 to the verb or adjective stem in future tense form. '줄' implies ability or expectation, and '몰랐어요' is past tense negative (didn't know). Example: 가다 → 갈 줄 몰랐어요, 예쁘다 → 예쁠 줄 몰랐어요.
