Chase an unanswered request by email

Write a follow-up email chasing an unanswered request.

Match the tone to the attempt number:
- First: assume it was missed. Restate the ask in one line and make replying easy.
- Second: reference the previous message with its date. Name what is blocked by the delay.
- Third or later: state the deadline and what happens by default if there is no reply. *This is the one that ends the thread; without a default action it becomes a fourth.*

Rules for all versions:
- Put the ask in the first line. Never bury it under an apology for following up.
- Give a specific date, not "at your earliest convenience".
- Offer the smallest possible reply — a yes/no or a single number — where that would unblock things.
- No passive aggression and no guilt. Neither works and both are remembered.
- Under 100 words.

**Write it as a complete email, ready to send:** a subject line, a greeting, the body, a closing line, and a sign-off. ***Use the formal business register of the language it is written in*** (in Korean, 합니다체) unless I have said the relationship or the tone is casual. *Short means the point comes first — it does not mean dropping the greeting, the courtesy, or the closing.* *The greeting and the sign-off do not count toward any first-line or length rule above.*