Prime Minister Hwang Kyo-ahn pays his respects during a visit to the March 15 National Cemetery in the southeastern city of Changwon on March 15, 2016, where democratic fighters killed in a 1960 pro-democracy demonstration are buried. South Korea marked the 56th anniversary of the pro-democracy demonstration in the city that added fuel to mounting public protests against the dictatorial regime of then President Rhee Syng-man. A nationwide protest took place on April 19, 1960, forcing the president to step down.