I don’t know about South Korea but over here we had decades warning us about over population . Guess some people actually believed it.
It’s funny how the left has things backwards. When poor countries industrialize and become wealthy, the birth rate declines. But the left is worried about overpopulation AND they are against industrialization and the increase of wealth for everyone under capitalism. They are concerned about the environment but they approve of inefficient, polluting industries in communist countries and they hate modern, less polluting industries in capitalist countries. Go figure.
American style feminism isn’t quite as popular in Asia, although the infection is present but you still get the same breakdown of the traditional family and sex roles that is driving the demographic decline in large part by the push to turn everybody into a direct consumer in the economy which ironically will strangle it in the long term with fewer babies.