The Korea Composite Stock Price Index (KOSPI) rose 2.1 percent, to 1,879.43 points, in its biggest daily percentage gain since September 9 last year. On the week, however, the index was down 2 percent.
Foreign investors were net sellers for a 12th straight session, unloading a net 155.5 billion won ($129.60 million) worth of shares on the main board, preliminary data showed.
The South Korean won ended local trade at 1,200.1 to the dollar, up 1.1 percent from Thursday's close of 1,213.7. For the week, the currency gained 1.1 percent.