Why are Asian countries like South Korea, Japan, and China have declining in human population?

Do people in Asia think they're too good to have children because they are too obsessed with traditional and being polite?

They are hurting their economy more than helping it because kids are the future. They need to get out of there shell's worrying about people judging them if they had a baby without being married

Why are Asian countries like South Korea, Japan, and China have declining in human population?
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