우리가 뭘

what we …

→ 우리
phrase Rare #16,893
what we … 뭘 is a shortened form of 무엇을 (“what” as the object of a verb). The full English wording depends on the verb that follows.
KO: 우리가 뭘 해야 해?
EN: What should we do?

그런데 우리가 뭘 할 수 있겠어?

But what can we do?

— 쿵푸팬더 4 (2024)