This is the 6288th most frequent Korean word.
신청했다고
"Applied" or "submitted an application."
신청했다고 is used to indicate the action of applying for something in the past, specifically referring to the graduate program.
그는 대학원 프로그램에 신청했다고 말했어요.
He said that he applied for the graduate program.
신청했다고 in this context refers to the action of booking a ticket, using a more formal term for it indicating past action in the written or recorded form.
나는 기차표를 온라인으로 신청했다고 기록했어.
I recorded that I booked the train ticket online.
In this sentence, 신청했다고 denotes the application for concert tickets, expressing the action was taken by another person in past tense.