The Government of the Republic of Korea does not permit dual citizenship after the age of 21. American citizens of Korean descent who hold dual citizenship under South Korean law and work or study in South Korea are usually compelled by the Republic of Korea to choose one or the other nationality soon after reaching that age. Multiple citizenship is simultaneous citizenship in two or more countries (whether it is recognized by all countries or not). ...
In addition, South Korean men over the age of 18, including American citizens of Korean descent, are subject to compulsory military service. A dual national may not be allowed to abandon his Republicof Korea nationality until he finishes his military service, or has received a special exemption from military service. There have been several instances in which young American men of Korean descent, who were born and lived all of their lives in the United States, arrived in the ROK for a tourist visit only to find themselves drafted into the South Korean army.
Multiple citizenship, or multiple nationality, is a status in which a person is concurrently regarded as a citizen under the laws of more than one state.
Dualcitizenship (being a citizen of two nations), or dual nationality, is by far the most common type of multiple citizenship, but nothing in international law prevents anyone from establishing citizenship in more than two countries.
A dual citizen is subject to travel restrictions, embargoes and sets of laws issued by multiple governments governing one's behaviour domestically and while travelling abroad.
The Government of the Republic of Korea does not permit dualcitizenship after the age of 21.
American citizens of Korean descent who hold dualcitizenship under South Korean law and work or study in SouthKorea are usually compelled by the Republic of Korea to choose one or the other nationality soon after reaching that age.
A dual national may not be allowed to abandon his Republic of Korea nationality until he finishes his military service, or has received a special exemption from military service.