What visa is f4?

This is not an ordinary business visa or tourist visa. South Korea F4 is a visa only for foreigners ~

The full name is "Declaration of Domestic Residence of Foreign Nationals", which is simply applicable to non-Korean nationals.

The domestic detention visa has identity restrictions, that is, academic qualifications, and requires a master's degree or above to apply. Delayed demand

Passport, residence certificate and 30 thousand won will be extended for 2~3 years.