This is what our gas bills look like here. They come handwritten on these skis of paper that the man places in our mailboxes every month. We pay by transferring money from our bank account to the business's at an ATM.
It took 4 months before I fully figured out what this bill meant. At first, a coteacher said it was a receipt and that I shouldn't worry about it, so I didn't. But after a while, I asked again and got the truth. Oh well. I paid the bill right away. Korean utilities are quite forgiving.