Woori Bank ATM Step. 1 Select [환전/다른업무 Foreign Languages] on the bottom-right side Step. 2 Select Cashmallow at the top left side. Step. 3 Enter 8-digit User ID, then click Check. Step. 4 Enter the Authentication Number shown on App Step. 5 After selecting get receipt, collect your cash Step. 6 Withdraw Cash at ATM