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In South Korea, some urban areas are called “moon neighborhoods,” or "daldongne" in Korean.

Although it is primarily for their location on higher ground, seemingly closer to the moon, the term also reflects the challenge of living in these areas, which are often steep, difficult to access and home to low-income households.

The term became widespread in the 1980s after the popular TV drama, “Daldongnae,” depicted the lives of rural-to-urban migrants who settled in makeshift homes in Seoul’s hilly neighborhoods.

Unable to afford housing in more developed flat areas, they built homes in the hills and mountains of urban areas like Seoul, Busan and Incheon.

Often constructed hastily with available materials, these neighborhoods were composed of simple shacks often made of wood, corrugated metal and cardboard. These kinds of housing are called "panjajip." The unplanned nature of these settlements created narrow, winding paths that cars couldn’t navigate, with limited access to utilities and a lack of basic infrastructure.

Many of these poor villages have since been demolished for urban redevelopment projects, typically involving the construction of apartment complexes.

However, a few still remain, often due to long-held disputes over compensation between developers and residents. They include Guryong Village in Seoul's Gangnam-gu and Gaemi Village in Seodaemun-gu.

A notable exception is Busan’s Gamcheon Culture Village, which transformed from a moon village of North Korean refugees and others into a popular tourist destination and cultural landmark.

Answer: (d)