I've been watching video about the American Rooftop Koreans incident in 1992. It's really interesting. The generation during that time had military experience due to South Koreans mandatory conscription which is why they were so successful.

https://youtube.com/watch?v=xWMj-mFUDGA&pp

https://media.letsfo.com/images/2026/05/26/mar-and-catoshi-rooftop-koreans-fight.webp