This is the 12728th most frequent Korean word.
대학원에
"대학원에" means "to/at the graduate school."
In this sentence, "대학원에" indicates the purpose or goal related to graduate school.
저는 지금 대학원에 지원서를 작성하고 있습니다.
I am currently writing an application for graduate school.
Here, "대학원에" denotes the destination involved in attending graduate school.
대학원에 가려면 연구 계획서를 준비해야 합니다.
To go to graduate school, you must prepare a research proposal.
In this example, "대학원에" signifies the institution one seeks to gain admission to.