I have no evidence for this beyond my own anecdotal experience but my guess is the biggest factor is lack of affordable housing. The average price of an apartment in Soul is 1.18 billion won (883k usd). It’s very difficult to buy a home and live off a single income as a young Korean, this is forcing people to start families later or not at all.
One compounding factor could be the extension of childhood, which has been a very successful strategy for humans, and is more prevalent in the developed world.
One compounding factor could be the extension of childhood, which has been a very successful strategy for humans, and is more prevalent in the developed world.