It appears new rules are being passed. Not that it will stop it.
https://www.google.com/amp/www.independent.co.uk/news/world/south-korea-market-dog-meat-slaughter-butchering-facilities-a7473546.html%3Famp
During the 1988 Seoul Summer Olympics, S. Korea closed down all of the roadside dog stands. Looks like it didn’t have any long lasting effect. Last I read, they eat 2.5 million dogs a year there.