* KOSPI rises, foreigners net sellers * Korean won weakens against U.S. dollar * South Korea benchmark bond yield rises SEOUL, Oct 28 (Reuters) - Round-up of South Korean financial markets: ** South Korean shares rose on Thursday, driven by sharp gains in SK Hynix and as solid corporate earnings and expectations of sustained growth in exports lifted investor sentiment. The won weakened, while the benchmark bond yield rose. ** The benchmark KOSPI rose 5.16 points, or 0.17%, to 3,030.65 by 0202 GMT, after declining 0.77% on Wednesday. ** Among heavyweights, technology giant Samsung Electronics and SK Hynix rose 0.29% and 3.94%, respectively. Battery maker LG Chem and automaker Kia jumped 2.79% and 2.59%, respectively. ** Samsung Electronics reported its highest quarterly profit in three years, though it said it expects component shortages to affect chip demand in the current quarter. ** That came days after SK Hynix posted its best quarterly profit in nearly three years on the back of rising prices and struck a more upbeat tone than rivals on demand for memory chips. ** South Korean exports are set for a 12th consecutive month of growth in October, while inflation will likely increase at its fastest pace in nearly a decade due to surging energy and commodities prices, a Reuters poll showed. ** Foreigners were net sellers of 44.9 billion won ($38.29 million) worth of shares on the main board. ** The won was quoted at 1,172.7 per dollar on the onshore settlement platform , 0.23% lower than its previous close. ** In offshore trading, the won was quoted at 1,172.5 per dollar, unchanged from the previous day, while in non-deliverable forward trading its one-month contract was quoted at 1,173.4. ** In money and debt markets, December futures on three-year treasury bonds fell 0.10 point to 107.85. ** The most liquid 3-year Korean treasury bond yield rose by 8.0 basis points to 2.119%. ($1 = 1,172.5400 won) (Reporting by Joori Roh; Editing by Subhranshu Sahu)