There are some useful expressions when you order food in Korea.
1. Yeo-gi-yo! (여기요!)
You can call a waiter or a waitress when you would like to order something.
(You can simply push the bell button on the table.)
2. E-geo-Ju-Se-Yo (이거 주세요!)
When you get the menu and choose what you want,
You can say, "This one please." In Korean, 이거주세요(E-geo-Ju-Se-Yo)
3. Jal-Muk-Get-Sb-Ni-Da (잘 먹겠습니다!)
When the food is served, you can say "Thank you" in Korean.
Jal-Muk-Get-Sb-Ni-Da means thank you for the food.
Or you can simply say, "감사합니다.(Gam-Sa-Ham-Mi-Da)
4. Gye-San-Hal-GGe-Yo (계산할게요)
You can ask for a bill after the meal.
Gye-San-Hal-GGe-Yo means "Bill, please "
In many cases you should go to the counter for paying the bill.
Why don't you try these expressions when you go to a Korean restaurant?