This is the 571st most frequent Korean word.
남자
Man; male.
In this sentence, '남자' is a noun used in the subject position, referring to 'man'.
저 남자는 친절하다.
That man is kind.
Here, '남자' is used as a direct object within a sentence, referring to 'man' in a descriptive context.
내 친구는 좋은 남자를 만났다.
My friend met a good man.
In this case, '남자' is used in a possessive form to indicate 'of the man' or 'the man's'.