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The document summarizes the currencies used in East Asia, including Korea, China, and Japan. It outlines that Korea used the mun, yang, won, and yen at different points from 1633 to 1945. North Korea uses the won since 1947 while South Korea used the won, hwan, and won from 1945 to present. China used cowry shells, copper coins during the Qin dynasty, and gold/silver yuan before adopting the renminbi. Japan first used rice and oldest coins before using the mon from 1336 to 1870 and the current yen since 1871. It also provides current currency exchange rates between the Japanese yen and US dollar, euro, British pound, Swiss franc, and AustralianRead less