* KOSPI falls, foreigners net sellers

* Korean won weakens against dollar

* South Korea benchmark bond yield little changed

SEOUL, Feb 20 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares fell 1% on Tuesday, as investors booked profits after a recent rally fuelled by optimism around the government's corporate reform plan.

** The benchmark KOSPI fell 27.31 points, or 1.02%, to 2,652.95 by 0148 GMT, after hitting a more than 20-month high in the previous session.

** Automakers and banks, which led the recent rally of undervalued stocks, fell sharply. Hyundai Motor dropped 3.76% and sister automaker Kia Corp lost 1.70%, while the Korea Exchange Bank Index was down more than 2%.

** Investor optimism will likely remain around the government's push to encourage more shareholder returns until the planned announcement of specific measures on Feb. 26, but profit-booking pressure is also mounting, analysts said.

** The Bank of Korea will keep its key policy rate on hold for a ninth consecutive meeting on Thursday, according to all economists polled by Reuters, who stuck to their long-held view the first rate cut would come in the third quarter.

** Among other index heavyweights, chipmakers lost more than 1%, but online platform companies rose.

** Of the total 934 traded issues, 290 shares advanced, while 590 declined.

** Foreigners were net sellers of shares worth 62.6 billion won ($46.79 million) on the main board.

** The won was quoted 0.11% lower at 1,336.7 per dollar on the onshore trade settlement platform.

** In money and debt markets, March futures on three-year treasury bonds rose 0.04 point to 104.55.

** The most liquid three-year Korean treasury bond yield fell by 1.4 basis points to 3.382%, while the benchmark 10-year yield rose by 0.3 basis point to 3.467%. ($1 = 1,337.8300 won) (Reporting by Jihoon Lee; Editing by Rashmi Aich)