The Waste Prince Starts as a Proton

In the feudal era, a failed country, the prince as a proton, magic and knights, and the Dragon Quest. Gu Heng traveled through time. He loved novels in his previous life, but he never imagined that his situation would be so dangerous. He was disgusted by the feudal system and decided to overthrow it. However, a demon king was killed halfway through. Let's see how he breaks the situation.