I, the Brave Man from Five Hundred Years Ago

Five hundred years ago, brave men and friends from another world defeated the Demon King... Five hundred years later, the brave man and the devil have become wild dogs on the roadside... The brave man known as the hero of mankind is living underground The greatest magister in history huddled in a damp cardboard box smoking a cigarette These two founders of civilization have been driven away by civilization When Chuangqi's holy sword and staff are returned, a new era will be opened by the two of them. The former Demon King's Castle has become a beacon of civilization The backward kingdom started a revolution in technology and magic The sacred city-state is blind to the belief in the gods The lost continent reveals the truth about the world