이란 거

that it is

→ 이다
phrase Rare #15,609
that it is Follows a noun and is a shortened form of 이라는 거. It can introduce or emphasize what something is, or that it belongs to a certain category.
KO: 이게 얼마나 중요한 일이란 거 알아?
EN: Do you know how important this is?

나도 심각한 일 이란 거 잘 알아

I know it's serious too.

— 로렌스 애니웨이 (2012)

감염 이란 거 혹시 그 할머니 때문 아닐까?

Could it be that the infection was caused by that old lady?

— 알.이.씨 (2007)

한국에서 온 선수들 이란 거 말곤 모릅니다, 진짜

I honestly don't know anything about them except that they're players from Korea.

— The Roundup (2022)

이건 사도 피터와 폴 이란 거?

Is this the one called the Apostles Peter and Paul?

— 러시아 방주 (2002)

서래 씨가 나하고 같은 종족 이란 거 진작에 알았어요

I knew a long time ago that Ms. Seorae was the same species as me.

— 헤어질 결심 (2022)