Fix The Final Mission's Mess!

Chen Yan wakes up one day to find himself as Roland, 4th prince of the Kingdom of Greycastle. With his knowledge from modern Earth and with the help of a witch named Anna; Roland embarks in a step by step technological pioneering. His goal is to evolve the current medieval world into a place where civilization is at its peak and make it into a world where witches and the normal humans can coexist freely. Time passes by and Roland and Anna finally has the power to change the world's negative views about the witches. But, just as they were about to take the final step, a mishap came resulting to the mission's failure. Both of them died and found themselves reborn  into the distant future. During this time, the witches and the humans both claimed 50% percent of the world's land. The witches' side had devastating magic as their core power while the humans'  had advance technology that are able to rival theirs. Anna was reborn earlier than Ronald. She was reborn in the human's side as a 'normal' girl And Ronald... He was reborn or should I say, created in the witches' side as the first ever male sorcerer.