The Korea Composite Stock Price Index finished down 0.5 percent at 1,996.6 points, marking a weekly loss of 0.7 percent.
Tech heavyweight Samsung Electronics closed up 0.2 percent after crisscrossing back and forth out of negative territory.
Auto shares lost ground on concerns that Japanese competitors will benefit from both a weakening yen and a strengthening won. Hyundai Motor dropped 1.7 percent while sibling Kia Motors fell 2.2 percent.
Australian shares slipped 0.3 percent with miners losing ground as a cyclone affected their operations, overshadowing gains in other sectors.
The S&P/ASX 200 index closed 12.3 points lower to 4,710.6.
BHP Billiton lost 2 percent after suspending offshore oilfields and rival iron ore miner Rio Tinto dropped 1.9 percent after shutting down key iron ore export terminals as a cyclone intensified off Australia's northwest coast.
Banks were mostly higher, with National Bank of Australia leading gains, up 0.5 percent. The Commonwealth Bank of Australia bucked the trend, slipping 0.4 percent.
New Zealand's benchmark NZX 50 index rose 0.3 percent to 4,131.8, a fresh five-year closing high.
Over in Southeast Asia, Singapore's Straits Times Index closed down 0.3 percent and Malaysia's KLCI Composite Index ended 0.1 percent lower.
India's BSE Index and the 50-share NSE Index ended 0.4 percent lower despite Infosys shares surging by 16.8 percent, potentially posting its biggest daily percentage gain, after reporting a stronger-than-expected October-December profit and raising its annual revenue forecast.