you know it
Do koreans really say this?
Also: day by day
Anyone got the BTS vibes from this. #BestOfMe
the only references that come up with a google search are bts references.
can someone give a simple example sentence which uses this expression?
I suggest using the Naver Korean-Englush dictionary app! There's usually tons of example sentences and other helpful features as well. One of the example sentences for 하루하루 is 내 스케줄은 하루하루 달라질 수 있다, which means "My schedule can vary from day to day".