How does Korean mandatory military service affect foreign residents, dual citizens, and children of international couples living in Korea?

Korean mandatory military service applies to male Korean citizens, so it generally does not affect pure foreign nationals, who have no service obligation. The situations to watch are about Korean nationality and dual citizenship. A man who holds Korean nationality, including a dual citizen, is subject to the conscription rules, and Korea has strict laws here: dual-national men generally must choose their nationality by early adulthood, and those who want to renounce Korean nationality to avoid service face significant restrictions, with renunciation timing tied to the military service age. Children of international couples can acquire Korean nationality, and if a son does and keeps it, the obligation can attach, so families often handle the nationality choice before the relevant age. Importantly, simply living in Korea as a foreigner, or being a child of an international couple who is not a Korean national, does not create a service obligation. Because the rules around dual citizenship, the deadline to choose, and overseas-resident exceptions are detailed and consequential, families in this situation should consult the Military Manpower Administration and a nationality specialist to handle the timing correctly rather than rely on general advice.