This is the 17270th most frequent Korean word.
석달만에
"After three months."
Here, '석달만에' indicates the time duration ('three months') since a certain event (last meeting) occurred.
그 친구를 석달만에 다시 만났다.
I met that friend again after three months.
In this example, '석달만에' refers to a time period starting from a previous point to the present ('after three months').
석달만에 새 집으로 이사했어요.
After three months, I moved into a new house.
Whereas in this sentence, '석달만에' emphasizes a change or result occurring over a duration of three months.