This is the 258th most frequent Korean word.
이준석
"이준석" is a Korean proper noun, typically used as a male given name. It can also refer to a South Korean politician.
'이준석' is used as a proper noun, representing a person's full name in Korean. It functions as the subject of the sentence.
이준석은 열심히 공부하고 있습니다.
Lee Joon-seok is studying diligently.
'이준석' in this sentence refers to an individual described by the speaker, introduced with the phrase '이준석이라는 친구', specifying a particular person recognized as a friend.
저는 이준석이라는 친구를 알고 있습니다.
I know a friend named Lee Joon-seok.
'이준석' in this context is utilized as a proper noun in the object case, referring to a specific individual whom the speaker mentions meeting.