What is the procedure for a foreign national who has entered Korea with a D-8 visa or for a foreigner who has entered Korea with a short-term visa / no visa and has received approval to change the status?

A foreigner who has entered Korea with a D-8 visa has to go to the immigration office and get an alien registration ID within 90 days of entry. A foreigner with a short-term visa or no visa with approval to change the status must go to the immigration office immediately after entry to obtain the alien registration ID.