Without knowing when your visa expires you can face challenges, penalties, and also fees. If your ID card doesn't specify it, or the ink may have faded, you can totally check it online.
What do you need to do?
1. Go to, hikrorea.go.kr
2. Then press on "Expiry date Check"
3. After you input your personal data (such as passport number, country, and date of birth)
4. Press confirm
