The won, which has been weak for months, recovered dramatically this week.
The won fell to another decade-plus low on Wednesday following a report of higher-than-expected inflation in the United States.
The won hit another decade-plus low Tuesday as the currency was battered by persistent rate worries and as decisive action to halt the rout was lacking.
The finance minister said the government stood at the ready as the won's precipitous decline continued, and he again threatened speculators betting against the currency.
The won renewed decade-plus lows after central bankers reaffirmed their hawkishness in Jackson Hole, Wyoming, over the weekend.
The Bank of Korea raised the base interest rate by a 25 basis points to 2.50 percent on Thursday.
Stocks finished a tad higher Wednesday as investors bet that the escalating tensions between two Koreas would have a limited impact on the financial markets. The won fell against the dollar.
Stocks closed lower Thursday, snapping a three-day winning streak, on the largest number of daily coronavirus infections in nearly two months. The won fell against the dollar.