The minimum wage in Korea is around 3,600 won per hour, but it's not always abided by in fastfood restaurants or stores where most highschool students and university freshmen students start their first part-time jobs.
The average part-time pay for an hour in Korea in these kind of shops is around 4,000 ~ 5,000 won, and if you work as a sales person in a department store for like a week, you get 10,000 won per an hour, but that's very very tiring as well.
BTW, Austin, apart from the visa, there's a different issue if you want to work for this shop - it's in 광주. You'll have to move there
haha
