Foreign investors turned net buyers of South Korean stocks in December, a month after selling off the second-largest amount in history, central bank data showed Wednesday. Offshore investors bought a net $1.19 billion worth of local stocks last month, following $9.13 billion in net sell-offs the previous month, according to data from the Bank of Korea (BOK). The November sell-off was the largest since the record selling of $9.33 billion in April. The country's benchmark KOSPI index rose more than 7 percent in December, aided by a bull run of semiconductor shares. The KOSPI advanced more than 75 percent last year. Foreign investors also snatched up a net $6.2 billion worth of bonds last month, following the largest net purchase on record of $11.81 billion the previous month, the data showed. Daily fluctuations in the won-dollar exchange rate narrowed, averaging 5.3 won in December, compared with 5.6 won a month earlier, the data showed.