Chung Un - chan first announced his resignation on July 5 . North Korea has vehemently denied charges it fired a torpedo that sank the Cheonan . President Lee Dong - ah did not accept Chung 's resignation at that time . Lee 's Grand National Party has taken a beating in the past .
Chung Un - chan first announced his resignation on July 5 . President Lee Dong - ah did not accept Chung 's resignation at that time . Lee 's Grand National Party has taken a beating in the past .