The domestic debt market also suffered a severe rout, spreading intense volatility across broader financial markets.
The won opened at 1,555.2 won per dollar, tumbling 16.1 won from the previous session. This marks the lowest level for the local currency since March 6, 2009, when it began trading at 1,597 won during the global financial crisis.
Severe weakness had already materialized in the offshore non-deliverable forward (NDF) market, where the rate broke through 1,560 won over the weekend. Meanwhile, retail exchange rates at several physical booths fell below 1,600 won.
Market sentiment crumbled after stronger-than-expected U.S. non-farm payrolls fueled expectations that the Federal Reserve, led by Chair Kevin Warsh, would pivot back to raising interest rates. Following the data, the Nasdaq plunged over 4 percent and the Philadelphia Semiconductor Index crashed more than 10 percent, while the U.S. Dollar Index surged past the 100 level.
These dual pressures are being directly reflected in South Korea's equity and foreign exchange markets. The benchmark KOSPI triggered a circuit breaker after plunging 8.37 percent to open at 7,477.46, while foreign investors offloaded over 900 billion won (US$578.7 million) during the morning session, further compounding downward pressure on the won.
As the currency rattled, heads of the nation's four financial watchdogs convened an emergency meeting on Sunday to issue high-intensity warnings against speculative one-way bets. Despite repeated hawkish signaling from Bank of Korea governor Shin Hyun-song hinting at rate hikes, exchange rate anxieties have shown no signs of calming.
While financial authorities refrained from announcing explicit direct interventions, market participants suspect that dollar-selling measures, including currency swaps with the National Pension Service, are actively underway.
After opening around 1,550, the won pared some early losses to trade near the upper 1,550s by mid-morning.
"While direct smoothing operations cannot be officially confirmed, we are observing tangible movements to cushion the currency's floor," an FX trader said on the condition of anonymity.
The debt market also faced severe disruption, with sovereign yields spiking to multi-year highs. As of early morning, the benchmark three-year government bond yield crossed 3.9 percent and the 10-year yield topped 4.3 percent, marking their highest levels since November 2023.
Downward pressure intensified as a domestic interest rate hike is increasingly viewed by the market as a foregone conclusion. Sentiment was further dampened as major global sovereign debt yields spiked in tandem, with the 30-year U.S. Treasury yield breaking above the 5 percent threshold.
South Korea's phased inclusion into the World Government Bond Index (WGBI) since April was intended to drive foreign capital inflows, but external shocks have completely muted its impact. A near-record net purchase of 10-year bonds by foreign investors on June 2 proved short-lived, as it was driven primarily by temporary 30-year bond auction rollovers.
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