Under what circumstances does Jeju Island detain a passport?

Withhold passports in cases of visa issues, security issues, etc.

1. Visa issues: If you do not have a valid visa or the visa has expired when entering Jeju Island, your passport will be detained.

2. Security issues: If you are suspected of being involved in security activities when entering the country, or your identity arouses police suspicion, you will be asked to withhold your passport for investigation.