The won strengthened 5.1 won from the previous session to close daytime trading at 1,392.6 per dollar, compared with Wednesday's close of 1,397.7.
It marked the second straight daytime close below 1,400 and the lowest closing level since Sept. 23, 2025, with the currency briefly strengthening to 1,384.1 during the session.
Exporter dollar selling and broader weakness in the U.S. currency supported the won early in the session, before importer demand and a weaker Japanese yen pared some of the gains.
The KOSPI rebounded 5.89 percent to 6,852.58 following Wednesday's sharp selloff, with foreign investors returning to net purchases.
South Korean government bonds ended mixed, with the three-year yield rising 1.3 basis points to 3.81 percent and the 10-year yield falling 1.4 basis points to 4.32 percent, according to final afternoon quotations from the Korea Financial Investment Association.
Longer maturities outperformed, with the 30-year yield dropping 4.6 basis points to 4.68 percent, following an overnight decline in long-term U.S. Treasury yields.
U.S. long-term yields fell after the Treasury announced an expansion of its bond buyback program, although the impact on shorter-dated Korean bonds remained limited.
Shorter maturities remained relatively weak as investors continued to assess the domestic monetary policy outlook ahead of the Bank of Korea's Aug. 27 rate-setting meeting.
Thursday's mixed close followed a broad bond rally the previous day, when the three-year yield fell 4.9 basis points to 3.80 percent and the 10-year yield dropped 4.5 basis points to 4.34 percent.
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