Lesser-known by outsiders, the community in Japan called the "Chongryon" is composed of Korean minorities who identify with North Korea. 

Ethnically Korean but brought over during Japanese occupation of the peninsula, the 150,000 people claiming North Korea as both their promised land and benefactors are often discriminated against in Japan. 

The cycle of discrimination leading to increased loyalty to the Kim regime and insulation is often repeated but has more recently escalated to issues of safety. 

The Vox Borders documentary above delves into this unknown community and the fine line between cultural barriers versus physical borders.