What is the scene exactly? Crushing beers at a bar? Dancing at a club?
Lunches are a different matter entirely. They would wolf down their meal in ten minutes. Not a drop of alcohol, until the day was done. Lots of energy drinks; even before the US had them.
Aaahnold made some money, doing Japanese energy drink ads: https://www.youtube.com/watch?v=XRLe826lyao
In comparison Koreans will nearly always drink alcohol on a daily basis and to a stronger concentration than what Japanese drink - even the Koreans in Japan.