Answer
During Roh Moo-hyun's presidency (2003-2008), the South Korean won appreciated against the US dollar, reaching its strongest value in 2007. This was due to a number of factors, including strong economic growth in South Korea, low interest rates in the United States, and the appreciation of the yen against the dollar. However, the won began to depreciate against the dollar in 2008 due to the global financial crisis.