Why is the Korean marriage visa so slow?

There are many application materials for marriage immigrants' F6 visa. The consulate should not only review the information of China applicants, but also review the information of Korean spouses in Korea. If you apply for a marriage immigrant visa and have lived in Korea for more than two years, your spouse can apply for nationality on the basis of maintaining marriage, so the examination of marriage immigrant visa is very strict. The time of normal consular review is also uncertain. The results can be produced in a month or two at the earliest, and it takes three months or even half a year to be slow. If supplementary materials are needed, the consulate will notify the travel agency or call the applicant. You can only wait patiently without notice of supplementary materials.