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Korea Permanent Residence (F-5) & Naturalization Basic Guide Permanent Residence (F-5) Acquisition Conditions General Standards: Legal residence in Korea for 5 years or more. Income requirements (GNI per capita of previous year or above). Basic Korean communication ability. High-value investors: Can apply immediately with investment of 500 million won or more. Outstanding talent: Early application possible with doctoral degree or specialized skills. Marriage immigration (F-6): 2 years or more domestic residence after marriage to a Korean + maintenance of marriage for 3 years or more. Permanent Residence Application Procedures Visit the Immigration, Enforcement and Foreigner Affairs Service. Required documents: Proof of residence history, proof of income, criminal record inquiry certificate, health insurance payment confirmation, etc. Review period: approximately 3-6 months. Naturalization (Acquisition of Korean Citizenship)