Well, up to them. If South Korea wants to turn into one giant San Francisco one day then let em have it.
You give foids an inch and they'll take a mile. This is only the beginning. South Korea has one of the lowest birth rates in the world. I guarantee you if mass immigration of non-Asian men were allowed their birth rate would rebound and normalize over time. They say no one knows the future but this prediction is something that I feel so certain about.
When SK turns into one giant San Francisco one day, where 70+ percent of Asian females are dating non-Asian men, then they will look back in this era at this video.
Only thing that can save humanity now would be a fast moving unexpected interstellar comet to come out of nowhere and splash into the pacific ocean. Wherein a mini mass extinction occurs followed by a nuclear war.