은 어디

where is …?

→ 은
phrase Very common #871
where is …? 은 marks the preceding noun as the topic. The phrase can also mean “where …?” with verbs such as “live.”
KO: 네 가방은 어디 있어?
EN: Where is your bag?

도사님은 어디 요?

Where is the Taoist priest?

— 곡성 (2016)

오딜은 어디 있는 거 지?

Where is Odile?

— 아메리카의 밤 (1973)