Jo Hyeon-woo have been my Keeper of the tournament so far at the Asian Cup. I have always wonder why he didn't get a chance to play for a Europe club. He always been consistent in his performance and was excellent against Germany at the 2018 World Cup.
Maybe it's similar to many players from Mexico, Russia, Saudi Arabia, Iran, South Africa, etc. Some of them are capable to play at the highest level in Europe but :
Too far from their home, it's not that easy to move and live alone or with your family abroad and you don't know if you'll stay for some months or 10 years, cultural differences, etc.
They are already paid a lot where they live and play
They are known, they are celebrities in their country, or they are happy and live very well already, no need to move
So it's good for them personally
However it can be detrimental and limit the national team performance, as seen for Mexico for example : since 1994 they always qualified for the World Cup but never gone further than the Round of 16