Moneytary Units The basic unit of the Korean monetary system is the won. Specifically, various notes and coins are used: Notes include thousand-won, five thousand-won, and ten thousand-won denominations, while coins include ten-won, 50 won, 100 won, and 500 won denominations. Notes are easily discernible by the colors and by the different portraits of historical figures on each. The 10-won and 50-won coins are the two smallest denominations. To illustrate, a local phone call costs 50 won.   Credit Cards Credit cards, including VISA, American Express, Diners Club, Master Card and JCB, are accepted at major hotels, department stores, and the larger restaurants, and at many retail outlets. VISA: http://www.visa.com/ Master Card: http://www.mastercard.com/ http://www.mastercard.com/kr/ (language : Korean) Diners Club: http://www.dinersclub.com/ American Express: http://www10.americanexpress.com/   Money Exchange Foreign bank notes and traveler's checks can be converted into Korean won at foreign exchange banks and other authorized money exchangers. The exchange rate is subject to market fluctuations. The Exchange Rate ARS Service : 82-2-3709-8000 (code No. 351) Thomas Cook: 82-2-733-6601 American Express Travelers Checks : 82-2-399-2916