In Korea everyone is juicing. Right now I am doing some orange juice but the popular drink is haedok juice or detox juice. It's green and made from onions, turnips, carrots, anything green and much more. I don't have a recipe yet but my wife is going to make me some tomorrow since she says I need to lose 20kg. Yeah right.
Anyway, if you need to get an expensive gift for your Korean foodie, then a good juicer is the cabbage patch kid of 2014. Good ones start at 300,000 won. We got ours from hurom.