중요한 게

what's important

→ 중요하다
phrase Uncommon #10,092
what's important 게 is a shortened form of 것이, meaning “thing” or “what”; the phrase is often used to say what is or isn’t important.
KO: 중요한 게 뭔지 먼저 생각해 봐.
EN: Think first about what’s important.

하지만 진짜 중요한 게 있잖아?

But there's something really important, right?

— TAR 타르 (2022)

참, 중요한 게 또 있습니다

Oh, there's one more important thing.

— 잠수종과 나비 (2007)