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The F-4 visa is for people of Korean descent (otherwise known as Gyopos, or 해외교포 in Korean) who are not Korean citizens. It allows you to stay in the country for 2 years. Additionally, you don't need a sponsor or a working visa and you may teach private English lessons.

The visa is defined as follows:

A Korean foreigner or his/her immediate family who left Korea after the Establishment of the Korean Government and renounced Korean citizenship.

A Korean foreigner or his/her immediate family who left Korea before the Establishment of the Korean Government and officially confirmed his/her Korean citizenship prior to obtaining- foreign nationality.

It is possible for a person to be issued an F-4 visa without realizing that he is technically a Korean citizen; in some cases gyopos who went to Korea with an F-4 visa were drafted into the Korean military to serve their obligations as citizens.[1]