Hahaha are you meeting with Korean work counterparts? God speed.
The first thing you get to do is "drink until death". This means drink until you pass out/vomit/die. Koreans measure your business capabilities based on how much you can drink, with the theory being the more you can drink, the more business deals you do (drinking is a business hobby, not a social one). Therefore people who can drink a sh*tload of booze are top businessmen.
Hopefully you do this in a Karaoke bar with "helpers".
Korean business spas are all male, and fully nude. As a show of affection you get to wash and scrub each others back in a tub full of naked dudes. I skipped this.
I would tell you more about the saunas, but your wife may read this thread and force you to cancel the Korea trip.
Authentic Korean BBQ is awesome. So is Bi Bim Bap. It sounds nasty but it's DELICIOUS. As a matter of fact, so is all Korean food. I miss it terribly