Is it strict to check illegal workers in Jeju Island, South Korea?

This place strictly investigates illegal workers.

Illegal workers on Jeju Island in South Korea are very strict. South Korea is not an immigrant country. In order to crack down on illegal immigrants, illegal employment is very strict. After being caught, you will never set foot in Korea again.

Landing tourist visa, the visa time is too short. In addition, tourist visas cannot be used for work. Once they are found by the police, they will be sent back to China and will not be allowed to enter the country for five years, which will also affect their visas to travel and work in other countries (with tainted records).