But it seems like Spain really helped Japanese football reach its golden age

In the 90s, there was a wall for Asia due to things like
South American technique stemming from individual talent, flexibility, and speed,
or the various tactics made possible by the five major leagues and the physical power of European football, along with the players capable of executing them.
But after Spain introduced intelligent play
using more passes and space utilization than their opponents,
Japan learned this extremely well, and it is now serving as the foundation for Japanese football.
I wonder what on earth Korea has been doing all this time.