The biggest issues in Korea dating is young men either (1) don't have enough money to date (because local women expect men to paying for everything) or (2) women reject men with old-fashioned social views. In my personal experience, comparing the most developed places in Asia (Japan, Korea, Taiwan, Hongkong, Singapore), young Korean men are the most like their fathers with out-of-date social views.
If a young Korean woman wants to have a few kids, without living in grueling poverty - is that possible with a husband who's not in the top 1% of earners? If not - then ignoring the 99% may be a want-to-be-mom's least bad strategy. :(
Are you native Korean or deeply tied to the culture? Else, this reads like silly Internet hyperbole. You have clowned yourself with this post. Literally, you think that only 1% of Korea can afford to raise multiple children? In truth, many choose to hyper-concentrate their attention and resources on a single child. As a result, they do have replacement rate for their population. However, lots of Koreans outside of Seoul also choose to have more than one child because the economic pressures are much lower.