This is the 13639th most frequent Korean word.
류재식
"류재식" is a Korean proper noun, typically used as a person's name.
In this sentence, '류재식' is used as a proper noun referring to a person's name.
류재식은 학교의 대표 선수입니다.
Ryu Jae-sik is the school's representative athlete.
Here, '류재식' again acts as a proper noun addressing a specific individual, indicating the person being referred to in the context.
오늘 류재식과 함께 공부했어요.
I studied together with Ryu Jae-sik today.
In this sentence, '류재식' is part of the expression '류재식답게,' used to describe behaving in a manner characteristic of the individual named Ryu Jae-sik.