The use of yen constituted 5.0 percent of the country's total import settlements in the October-December period, up 0.1 percentage point from the July-September period, the Bank of Korea (BOK) said.
BOK officials attributed to the rise to an increase of imports from Japan amid a prolonged weakness of the yen.
Meanwhile, the portion of U.S. dollar accounted for a dominant 83.8 percent of the total, down 0.7 percentage point from three months earlier, the BOK said.
The comparable figure stood at 5.8 percent for euro, up 0.2 percentage point from three months earlier; and 4.2 percent for Korean won, up 0.3 percentage point.