This is the 385th most frequent Korean word.
지금까지
"Until now" or "so far."
In this sentence, '지금까지' is used to indicate the period of time until now.
지금까지 열심히 공부했어요.
I have studied diligently up to now.
'지금까지' emphasizes the lack of knowledge or awareness up to the current moment.
지금까지 난 몰랐어요.
Until now, I didn't know.
Here, '지금까지' refers to all past experiences before the present moment in time.