This whole thing - kids not knowing how to play, not doing what every single kid before about 50 years ago has done - has unfortunately been going on for a while in the US as well.

My kids grew up in a house in a "nice" neighborhood (great school district). It was a complete wasteland in terms of kids playing independently outside. It just didn't happen. Parent organized playdates, or nothing (i.e. solo screen time).

Korea may be worse, but just going outside of Korea will almost certainly not be good enough.