This is the 11345th most frequent Korean word.
김윤기
"김윤기" is a Korean name and does not have a specific definition; it typically represents a person's given name and family name.
In this sentence, '김윤기' is used as a proper noun, referring to a person's full name.
김윤기는 오늘 학교에 갔습니다.
Kim Yun-gi went to school today.
Here, '김윤기' is possessive, indicating that the book belongs to Kim Yun-gi.
김윤기의 책을 읽었습니다.
I read Kim Yun-gi's book.
In this instance, '김윤기' represents the individual with whom the speaker had dinner.