-았/었던 것 같다
I think (it was)
TOPIK 3A guess about a past event: 'I think it was ~'.
Examples from real articles
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지난해 9월 마포대교 점검 사진에서 당시 야당이었던 민주당에서도 큰 비판이 나왔다.
In the bridge inspection photo from September of last year, even the Democratic Party, which was then the opposition party, issued strong criticism.
Controversy over Former Presidential Aide's Vlog →
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Articles that use -았/었던 것 같다 in context — open one to read it in full.