사고라고

that it is an accident

→ 사고
phrase Rare #23,023
that it is an accident 사고라고 combines 사고 (accident) with 라고, which marks a quoted statement or claim. Depending on context, it can also mean “calling it an accident.”
KO: 그건 단순한 사고라고 생각해요.
EN: I think that it was just an accident.

애슐랜드 선생이 말한 거 요 자전거 사고 라고 아이가 직접 말했어요

The child said himself that it was a bicycle accident, as Mr. Ashland said.

— 캐치 미 이프 유 캔 (2002)

그것도 사고 였습니다 사고 라고?

That was an accident too. An accident?

— 엘리트 스쿼드 (2007)