It turns out Kim Yeon-koung was everything for women's volleyball

If you compare women's volleyball before Kim Yeon-koung, during her active years, and after her career...
The national team's performance was only good while Kim Yeon-koung was active...
Before and after that, they were consistently poor.
Kim Yeon-koung was simply in a class of her own that couldn't be produced in Korea.
The actual skill level of women's volleyball was just at that level.