This is the 3447th most frequent Korean word.
둘은
"둘은" means "the two are" or "as for the two" in English.
In this context, '둘은' refers to two people connected by a long-standing relationship.
둘은 어릴 적부터 친구였습니다.
The two have been friends since childhood.
In this sentence, '둘은' refers to two people or entities that are being discussed as acting together.
둘은 항상 같이 다닙니다.
The two always go together.
Here, '둘은' denotes two individuals whose characteristics are being contrasted.