South Korea's main stock exchange suffered the heaviest loss among key advanced and developing markets over the past one-month period. 
 
The benchmark Korea Composite Stock Price Index(KOSPI) closed at two-thousand-366-point-40 on Wednesday after hitting a record peak on July 24th at two-thousand-451-point-53. That's a drop of three-point-47 percent, according to data released by the Korea Center for International Finance and investment firms on Friday.
 
Japan's Nikkei fell two-point-71 percent during this time, marking the second-biggest fall. U.S. stock markets NASDAQ and S&P 500 slipped two-point-07 percent and one-point-05 percent during this period, respectively. 
 
Gainers included Brazil, which posted the biggest increase of eight-point-26 percent, Russia's RTSI and Hong Kong's Hang Seng. 
 
The KOSPI's relatively big loss is mainly due to market adjustments after eight straight months of gains as well as geopolitical risks from North Korea's missile threats and America's hawkish stance on Pyongyang.