Korean banks have bank books. They don’t use Western style checks (and frankly after the 1960s, why would you?) in South Korea. Instead they have debit cards, credit cards, mobile banking, online banking, and bank books. The bank books are inserted into ATMs and bill paying machines. With the ATM you will get a chance to record your latest transactions in your account to your book, deposit money, withdrawal money, or get some check-like money order something (obviously I haven’t used that strange function).