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한다는

that (someone) does; that ... does, that (someone) has to, that (someone) must

→ 하다
한 do or perform + 다는 indirect-quotation ending
verb · informal Uncommon #7,655
that (someone) does; that ... does Introduces a reported statement or fact as a modifier.
KO: 민수가 운동을 한다는 걸 알아요.
EN: I know that Min-su exercises.
Conjugation of 하다

“며칠은 기다려야 한다는 말 인가요?”

So, are you saying I’ll have to wait a few days?

나는 톰이 프랑스어를 한다는 것을 잊고 있었다.

I had forgotten that Tom spoke French.

죽여야만 한다는 건가?

Does that mean I have to kill him?

— 엠 (1931)

나와 자네가 무슨 이야기를 한다는 거 지?

What is it that you and I are supposed to be discussing?

— 극장판 귀멸의 칼날: 무한열차편 (2020)

auxiliary · informal Rare #26,211
that (someone) has to, that (someone) must Used in the obligation pattern -아/어야 한다, followed by 는 to introduce the clause as something being mentioned or known.
KO: 오늘은 일찍 가야 한다는 걸 알아요.
EN: I know that I have to leave early today.
Conjugation of 하다
Quotative
한다는한다고