The chipmaker's surge briefly lifted Korea's benchmark KOSPI above the 5,300 level earlier in the session, though the index later pared gains to finish nearly flat at 5,224.36. The junior KOSDAQ retreated 1.29 percent to 1,149.44, taking a breather after a stunning run earlier this week.
The won weakened to 1,441 per dollar as the greenback strengthened globally. The move followed reports that former Federal Reserve governor Kevin Warsh is emerging as a leading candidate to become the next Fed chair, a development that pushed U.S. Treasury yields higher and added pressure on emerging-market currencies.
Heavy retail buying offset selling by foreign investors and institutions. Individual investors snapped up a net 2.30 trillion won worth of shares, while foreigners and institutions sold a net 1.97 trillion won and 424.7 billion won, respectively.
Market attention remained firmly on SK hynix, which continued to outperform on strong AI-related demand. The shares extended gains into afternoon trading, buoyed by rising interest from global retail investors and a target-price upgrade from Citigroup.
Citing expectations of sharp increases in DRAM and NAND prices, Citi raised its target price to 1.4 million won. Despite intermittent profit-taking, strength in high-bandwidth memory (HBM) and sustained AI-driven demand underpinned additional buying, sending the stock up 5.57 percent to close at 909,000 won.
Gains, however, were largely confined to SK hynix. Most heavyweight stocks retreated, with Samsung Electronics edging down 0.12 percent to 160,500 won. Samsung Biologics slid 1.75 percent to 1,745,000 won, Samsung Life Insurance fell 1.93 percent to 188,300 won, and LG Energy Solution dropped 4.44 percent to 398,000 won.
In the defense and aerospace sector, Hanwha Aerospace closed unchanged at 1,300,000 won.
Shipbuilding stocks weakened, with HD Hyundai Heavy Industries falling 2.21 percent to 575,000 won and Hanwha Ocean down 2.40 percent to 138,500 won.
Auto shares extended declines as tariff-related cost concerns continued to weigh on the sector. Hyundai Motor tumbled 5.30 percent to 500,000 won, while affiliate Kia slipped 1.48 percent to 152,600 won.
Elsewhere in Asia, Japan's Nikkei 225 dipped 0.10 percent to 53,322.85 amid unease over potential shifts in U.S. monetary-policy leadership. China’s Shanghai Composite fell 0.96 percent to 4,117.95.
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