This is the 3699th most frequent Korean word.
사이에선
"사이에선" means "among" or "between" in a certain context.
The term '사이에선' in this sentence translates to 'among' and is used to describe the perspective within a specific group, namely 'friends'.
그는 친구들 사이에선 인기있다.
He is popular among his friends.
Here, '사이에선' is used to indicate the relationship or perspective between entities, in this case, cities.
그 소식은 도시 사이에선 빠르게 퍼졌다.
That news spread quickly between the cities.
In this instance, '사이에선' denotes the perception within a group of people, specifically colleagues.