Yap.Town

라는 것을

that ...; the fact that ...

→ 이다
phrase Rare #20,456
that ...; the fact that ... Marks a preceding statement as something known, believed, or mentioned. It often follows a quoted or reported clause.
KO: 톰이 이길 거라는 것을 알고 있었습니다.
EN: I knew that Tom would win.

메리와 앨리스가 서로 자매 라는 것을 알고 있었어?

Did you know that Mary and Alice were sisters?