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됐구나

has become, turned out to be

→ 되다
됐 Past tense + 구나 Exclamatory realization
verb · informal, past tense Rare #23,936
has become, turned out to be The ending -구나 expresses realization or surprise.
KO: 벌써 봄이 됐구나.
EN: Oh, it’s spring already.
Conjugation of 되다
Optative past
됐구나

이제 오스카가 형이 됐구나

Oscar is a big brother now.

— 양철북 (1979)

어른이 다 됐구나

You've really grown up.

— 퍼펙트 블루 (1998)

시간이 벌써 이렇게 됐구나

I can't believe it's already this late.

— 이웃집 토토로 (1988)

안 됐구나

Oh, it didn't work out.

— 해리 포터와 불사조 기사단 (2007)