[SK Hynix drops nearly 10%, South Korea's KOSPI index closes down 5.54%] Odaily Planet Daily News: According to MSX.COM data, the Nikkei 225 index closed down 1.31% at 66,588.12 points; South Korea's KOSPI index closed down 5.54% at 8,160.59 points. SK Hynix dropped nearly 10%, and Samsung Electronics fell more than 6%.