South Korea's president vowed to open its currency market for around-the-clock trading, giving easier access to foreign investors as the country seeks to boost the domestic stock market and as stalled U.S. trade talks weigh on the won. "There is quite a time limit in the currency trading market, but we plan to scrap nearly all of it," President Lee Jae Myung said on Thursday at an investor event in New York, according to a media pool report.