I Transform into a King and Hero to Save the World

My name is Feng Fu, I come from the future, and I write novels specifically to tell my story. Take me as a lesson and don't make my mistakes! The day after the college entrance examination, a huge pure black pyramid spacecraft suddenly appeared in the sky. The city was attacked. In times of crisis, the King System was obtained. Beep! Your hero has been chosen, please start fighting... Toot! You have reached the general level, do you want to change his hero... Toot! You have reached the monarch level, do you want to melt other hero skills...