When to use resignation letter in Korean
Korean: 사표[ sa-pyo ]

When to use it
A resignation letter (사표) is a letter or message you give when you want to leave your job. People often use it with the verb "submit" or "hand in." In Korean, a very common phrase is "submit a resignation letter."
Example sentences
저는 오늘 회사에 사표를 냈어요.
I handed in my resignation letter at the company today.
아버지는 사표를 쓰고 집에 일찍 왔어요.
My father wrote his resignation letter and came home early.
팀장은 제 사표를 보고 놀랐어요.
The team leader was surprised when he saw my resignation letter.
민수는 카페에 사표를 냈어요.
Minsu handed in his resignation letter at the cafe.
"정말 사표를 낼 거예요?" "네, 다음 달에요."
"Are you really going to hand in your resignation letter?" "Yes, next month."
그는 여행 전에 사표를 냈어요.
He handed in his resignation letter before traveling.