Having been to Jeju Island twice, will I still be refused entry?

Yes. Jeju Island is a special autonomous province of South Korea. You need a passport to go to Jeju Island. If you go to Jeju Island twice without a passport, you will be refused entry. Jeju Island is the largest island in South Korea. It is located in the southwestern waters of South Korea, with an area of ??1,845 square kilometers and a population of 668,000. The island has a pleasant climate and is a famous tourist island. There is Jeju City on the north coast.