This chapter explores what border-crossing tells us about the linkage between citizenship and rights-claiming by examining the experiences of North Koreans who resettle in South Korea, focusing on the security screening process that occurs immediately after they arrive on South Korean soil. Although North Koreans are often described as having “automatic citizenship” in the South under both constitutional and communitarian conceptions of citizenship, that claim is only partially accurate. I show that North Koreans must exhibit considerable agency to claim citizen-standing, and their rights are heavily circumscribed and contingent on state recognition of their identity throughout the screening process. The chapter elucidates how marginalized citizens claim rights at a site of maximal state power (Korea’s deep and securitized border) and illuminates how the gap between legal recognition of rights and their instantiation in state practice can render the claims process extended and arduous even for individuals whose citizen-standing is already theoretically established.