This is the 14475th most frequent Korean word.
문정화
"문정화" is a Korean personal name and does not have a specific meaning unless interpreted by its individual hanja (Chinese characters).
In this sentence, '문정화' is used as a proper noun referring to a person's name, specifically a teacher.
문정화 선생님은 한국어를 가르치십니다.
Teacher Moon Jeong-hwa teaches Korean.
Here, '문정화' is used as a possessive form relating to the works or creations attributed to Moon Jeong-hwa.
문정화의 작품은 정말 감동적이다.
Moon Jeong-hwa's works are truly moving.
In this case, '문정화' is employed to denote someone's name, elaborating the identity of the individual referred to.