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이 뭔데

what is …?

→ 이
phrase Uncommon #9,046
what is …? 이 is a subject particle attached to a noun ending in a consonant, and 뭔데 is a casual form meaning “what is.”
KO: 결론이 뭔데?
EN: What’s the conclusion?

제품이 뭔데?

What is the product?

— 미스터 헐리웃 (2000)

폴 룸이 뭔데?

What is a pole room?

— 아노라 (2024)

네 생각이 뭔데 그러니?

What do you think?

— 마농의 샘 1부 (1986)