Death of Kospi leader rattles markets across the region . While Kim 's son , Kim Jong Un , is widely believed to have been groomed as a successor , no official announcement has been made . South Korea 's North Korean index slides 3.5 % at the open . Markets from Japan to South Korea 's also sink on the news . Concerns grow over succession struggle in North Korea .
Death of Kospi leader rattles markets across the region . South Korea 's North Korean index slides 3.5 % at the open . Markets from Japan to South Korea 's also sink on the news . Concerns grow over succession struggle in North Korea .