I'm reminded of the Harrison Ford quote "you can have any colour car as long as it's black."
Mexicans are good at integrating people - in this case the usually reserved Koreans, because Mexicans want you to perform your behaviours in a Mexican way, and they make you part of the in-crowd quickly.
Compare this to other countries, like Germany, where even if you speak German fluently there's a good chance they'll switch to English and ignore your efforts, making you wonder what the point of learning the difficult language was.
Never thought we would see the day South Korea fans would be chanting “CULERO, CULERO” at the ref at Mexican stadiums. 😭🇰🇷