KOREAN RETAIL LOST $1.7 BILLION IN UNDER 3 MONTHS. 2X ETFS ON SAMSUNG AND SK HYNIX. 2.3 TRILLION WON. REALIZED. TEN BROKERAGES. MAY 27 TO AUG 14. ONE SK HYNIX LEVERAGE ETF FELL ABOUT 76% OFF ITS JUNE PEAK. REGULATORS SHUT NEW LISTINGS IN JULY.