Here is a little cheat sheet for the Korean currency so you know how much you are actually spending.
The national currency in Korea is the WON (KRW ₩), and generally comes in increments of 1000.
So ₩1000 equals about $1.15
Coins: ₩100, ₩500
Banknotes: ₩1000, ₩5000, ₩10000, ₩50000
You can print out this little chart to keep with you for when you are going to the store.
₩ Can$
100 .11
500 .57
1000 1.15
2000 2.30
5000 5.75
10 000 11.50
20 000 23.00
50 000 57.40
100 000 115.00
This is a ₩10000 note. It is essentially an $11 bill to a Canadian