The Complete Guide to Required Documents for Aliens Series Current: Required Documents for Aliens Part 2 | Obtaining and Using the Alien Registration Document Part 1: Obtaining and Using the Alien Registration Document Part 3: Reporting a Change of Residence and Submitting Supporting Documents Part 4: Required Documents for Extending Your Stay and Changing Your Status Part 5: Immigration, Repatriation, and Translation Documents View the full comprehensive guide All About Required Documents for Aliens Once you have your Alien Registration Document, it's time to learn about the Alien Registration Document. This is a document that officially proves a foreigner's residency history and status, and is required in a variety of situations, including banking, government filings, visa extensions, employment, and more. As of 2025, it can be obtained both online and offline, and knowing exactly how to get it and where to use it will make your life in Korea much easier. What is a Certificate of Alien Registration? A Certificate of Alien Registration is a document that certifies a foreigner's registration information and status of residence.