This is the 4412th most frequent Korean word.
함께한
"Together" or "done/shared together."
In this sentence, "함께한" is an adjective modifying "시간" (time). It expresses the time shared together with someone.
우리 함께한 시간이 정말 소중했다.
The time we spent together was truly precious.
Here, "함께한" is used to describe "친구들" (friends) as companions during shared experiences or activities.
그는 함께한 친구들에 대해 이야기했다.
He talked about the friends he spent time with.
In this instance, "함께한" modifies "추억" (memories), indicating they were memories made together with others.