Cheng Yan, a modern engineer from Earth who was suddenly reincarnated as Roland Wimbledon, the fourth prince of the Kingdom of Graycastle. Different from the modern world, this new world is filled with magic, hunted witches, and the threat of demons. Roland soon realizes that witches are not actually monsters, but humans with unique powers. Instead of hunting them down like other kingdoms, he protected and recruited wizards to build his small territory, Border Town, into a modern industrial and military power. Over time, his project grew from mere survival to a grand ambition to change the entire world.