Sekeun Jang worked at the Ministry of Justice and embassies of the Ministry of Foreign Affairs, dealing with immigration policies and practices. Immigration policy is one of administration fields that handles the legal status of all foreigners residing in Korea, including visa issuance, immigration inspections at airports and ports, various permits required for activities of foreigners residing in Korea, punishment of a resident alien who violates law, grant of the right of permanent residency, recognition of refugee status, permission of naturalization, and social integration task.