Nearly 8,600 foreign visitors were denied "no-visa" entry to Korea's southern Jeju island between January and the end of August.
Data from the Ministry of Justice shows one.three percent of all applicants have been refused entry this year.
The same ratio was a third of one percent in 2014.
The Korean Immigration Service says most of those refused entry had not properly clarified the purpose of their visit, while some were found to be traveling on fake passports.
Authorities believe some of these applicants try and enter Jeju illegally and then attempt to secure a job on the island or in other parts of Korea.
Since the Jeju provincial government enacted its no-visa entry policy in 2002, nearly three million foreigners have traveled there under the program, with 99 percent being Chinese nationals.