VUSA CARD is the membersip card of Daily Shim Eun-Ha.
Remember that it's not a plastic but a paper(image) card.
If you use this card in stores below,
You can get some discount.

KFC(0%), PizzaHut(0%), McDonald's(0%)
Lotteria(0%), BaskinRobbins(0%), CGV(0%)

In a word, everywhere + 0%.... hehe~~