This is the 5438th most frequent Korean word.
류성걸
"류성걸" is a Korean proper noun, typically used as a male given name.
Here, '류성걸' is used as a proper noun representing a person's name.
류성걸에게 책을 빌렸습니다.
I borrowed a book from Ryusunggeol.
Here, '류성걸' is again a proper noun referring to an individual who is responsible for a task.
이번에 류성걸이 발표를 맡았습니다.
This time, Ryusunggeol is in charge of the presentation.
In this example, '류성걸' serves as the subject of the sentence, highlighting their characteristic of being trustworthy.