이 하나 있는데

there's one…

→ 이
phrase Common #4,392
there's one… Follows a noun to introduce one thing that exists or that the speaker has, often as a lead-in to what comes next.
KO: 질문이 하나 있는데요.
EN: I have one question.

실은 내게 아들이 하나 있는데 난… 걔가 창피해 죽겠어요

Actually, I have a son, and I’m… so embarrassed by him I could die.

— 피키 블라인더스: 불멸의 남자 (2026)