Korean society is dystopian, they work some of the longest hours, more than Japan. And Japan is already so bad that its common to see people sleeping on the train or on the street because they spend their whole weekend at work. And the birth rate is abysmal. They have such extreme culture norms as well, with average weight being looked down on as ''fat''. Insane amount of peer pressure, with the highest suicide rate in the world.
We should not copy everything, just take what works and leave the rest.