사무실이

office

→ 사무실

phrase Rare #32,060

office 이 is a subject particle attached to 사무실, marking the office as the subject of the sentence.

KO: 사무실이 9시에 열어요.

EN: The office opens at 9.

Please pretend you don’t know until the office opens in the morning.

— 이중 배상 (1944)

The office is in chaos.

— 퍼펙트 블루 (1998)