This is the 11321st most frequent Korean word.
김성규가
"김성규가" does not have a standalone meaning; it likely refers to "Kim Sung-kyu" (a name) with a subject marker "가" in Korean grammar.
In this sentence, '김성규가' functions as the subject of the verb '갑니다' (goes).
김성규가 학교에 갑니다.
Kim Sung-kyu goes to school.
Here, '김성규가' indicates the person who is the object of liking conveyed by '좋아요' (like).
나는 김성규가 좋아요.
I like Kim Sung-kyu.
In this case, '김성규가' acts as the subject performing the action of '읽었어요' (read).