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악몽을

a nightmare

→ 악몽
phrase Rare #29,857
a nightmare 을 marks 악몽 as the object of the verb. In 꾼 걸 거야, 꿨어, and 꾼 것 같네, 악몽을 꿨다 means “had a nightmare” or “dreamed a nightmare.”
KO: 어젯밤에 악몽을 꿨어.
EN: I had a nightmare last night.

악몽을 꿨어

I had a nightmare

— 폭풍의 시간 (2018)

잠깐 악몽을 꾼 것 같네

It seems like you had a brief nightmare.

— 너자 (2019)

악몽을 꾼 걸 거 야

You must have had a nightmare.

— 데드 돈 다이 (2019)