The KOSPI gained 233.51 points or 3.68 percent to 6,579.04 as Samsung Electronics climbed 16,000 won, or 6.7 cent, to 255,500 won and SK hynix 5.5 percent,to 1.504 million won.
The advance far outpaced gains across the region, where Japan's Nikkei 225 added 0.8 percent to 67,524.06 and Shanghai's composite index 0.4 percent to 3,948.84.
Foreign investors were net buyers of 2.84 trillion won on the main board, while institutions purchased 527.8 billion won and individuals sold a net 3.19 trillion won.
The buying reflected renewed enthusiasm for artificial-intelligence and semiconductor shares, which have remained a major driver of Korea's market as investors continue to bet on demand for AI infrastructure.
Samsung Electronics and SK hynix were joined by a wide range of large-cap technology stocks, preventing the rally from being concentrated entirely in the two biggest chipmakers.
SK square jumped 8.4 percent to 1.024 million won, Samsung Electro-Mechanics rose 5.8 percent to 1.335 million won and Hanwha Aerospace gained 5.3 percent to 1.156 million won.
LG Electronics surged 12.8 percent and LG Innotek advanced 11.1 percent as electronics stocks emerged as one of the strongest groups on the main board.
The electronics sector rose 12.4 percent overall, while semiconductor-related shares including UBIQUIS and Soulbrain gained 16.6 percent and 13.0 percent, respectively.
The KOSPI 200 climbed 42.03 points, or 4.3 percent, to 1,029.43, showing that the advance extended across much of the large-cap market.
The KOSDAQ was considerably weaker, edging up 1.07 points, or 0.1 percent, to 858.91.
Samsung Biologics was among the notable decliners, falling 3.7 percent to 1.549 million won, while HD Hyundai Heavy Industries dropped 1.4 percent to 496,000 won.
The strength in Korea contrasted with more modest gains elsewhere in Asia.
In Tokyo, Recruit Holdings rose 3.1 percent to 16,660 yen, Advantest gained 0.9 percent to 34,550 yen and Mitsui Kinzoku advanced 4.1 percent to 29,000 yen.
The Shanghai composite wrapped up around 3,948.84, up 14.75 points, or 0.4 percent, with Xinjiang Bai Hua Cun Pharma Tech surging 10.0 percent to 14.03 yuan.
WuXi AppTec fell 0.9 percent to 158.82 yuan and ICBC declined 1.1 percent to 7.52 yuan.
The won weakened to 1,416.60 per dollar, down 3.10 won from the previous session.
The day's trading left Korea as the clear regional leader, with foreign buying and a broad-based surge in technology shares pushing the KOSPI sharply higher as investors returned to the AI and semiconductor trade.
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