This is the 14862nd most frequent Korean word.
박종훈이
"박종훈이" is a Korean name and refers to "Park Jong-hoon," with "이" being a subject marker indicating "Park Jong-hoon is (subject)."
박종훈이는 the subject of the sentence, acting as the one who studies.
박종훈이는 학교에서 공부를 열심히 합니다.
Park Jonghoon studies diligently at school.
박종훈이를 acts as the object of the sentence, the person receiving respect.
박종훈이를 친구들이 존경합니다.
Friends respect Park Jonghoon.
박종훈이에 identifies the person being talked about, with '에 대해' indicating the topic.