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중이었다

was in the middle of; was underway

→ 중
phrase Rare #26,190
was in the middle of; was underway Used after a noun to say that an activity or process was in progress at a particular time.
KO: 안토니오는 안쪽 방에서 회의 중이었다.
EN: Antonio was in a meeting in the inner room.

모두 이미 사용 중 이었다.

They were all already in use.

방에서 남자 껴안고 리허설 중 이었다?

You were in the room hugging a man while rehearsing?

— 물랑루즈 (2001)