Azure Billing local currency

Question

Hello, I am a user using Azure in Korea.

I using Azure storage in test model, and usage fee of 14.00KW (KRW) was charged. I registered my credit card and paid 14.00KW. However, more than 700KW was actually paid for. In fact, they were charged over 50 times more.

Why is there such a big difference in cost?

I tested it before connecting Azure service to my mobile application.