This is the 7819th most frequent Korean word.
해온
"해온" means "have done" or "have been doing," often used to describe actions completed or continued over time.
In this sentence, '해온' is used to indicate an action that has been continuously carried out and completed up to the present.
그는 지난 몇 년 동안 꾸준히 연구를 해온 학자이다.
He is a scholar who has been steadily conducting research over the past few years.
'해온' here is used to describe accumulated experiences from past actions until now.
우리는 함께 많은 프로젝트를 해온 경험이 있다.
We have experience working on many projects together.
In this case, '해온' represents completed actions performed in the past that have relevance and significance in the present.