* KOSPI marks sharpest fall in seven weeks

* Korean won hits 2-yr low against U.S. dollar

* South Korea benchmark bond yield falls

* For the midday report, please click

SEOUL, April 25 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares fell on Monday by their most in seven weeks on concerns of aggressive monetary policy tightening in the United States and an economic slowdown in China. The Korean won dropped to its lowest in more than two years, while the benchmark bond yield also slumped.

** The benchmark KOSPI closed down 47.58 points, or 1.76%, at 2,657.13. The index marked its sharpest fall since March 7, and lowest close since March 15.

** The U.S. Federal Reserve's stronger pivot to a hawkish stance and worries of more COVID-19 lockdowns in China dragged the market lower, said Samsung Securities' analyst Seo Jung-hun.

** South Korea's central bank will release advanced gross domestic product data for the first quarter on Tuesday, with growth likely slowed down significantly as restrictions imposed to prevent the spread of COVID-19 slammed the brakes on consumer spending.

** SK Bioscience jumped 6.67% after the company said trial results of its COVID-19 vaccine suggested more effectiveness in preventing infections than that of Atrazeneca's.

** Foreigners were net sellers of 733.4 billion won ($586.47 million) worth of shares on the main board.

** South Korea's foreign exchange authority issued a verbal warning against volatile currency market movement as the won fell to its weakest since March 2020.

** The won closed trading at 1,249.9 per dollar on the onshore settlement platform, 0.86% lower than its previous close and marking its lowest level since March 24, 2020.

** In offshore trading, the won was quoted at 1,250.5 per dollar, down 0.5% from the previous day, while in non-deliverable forward trading its one-month contract was quoted at 1,252.2.

** In money and debt markets, June futures on three-year treasury bonds rose 0.30 point to 105.55 in late afternoon trade.

** The most liquid 3-year Korean treasury bond yield fell by 8.6 basis points to 2.900%, while the benchmark 10-year yield fell by 11.5 basis points to 3.232%. ($1 = 1,250.5300 won) (Reporting by Jihoon Lee; Editing by Subhranshu Sahu)