The Sea of Heavenly Demons

Li Yan asked, “Heavenly Demons, where did they come from?” The old man replied, “Do you know of the ancient Qin Dynasty?” “I know a little. But what does it have to do with them?” Li Yan asked. “Everything. The Heavenly Demons are what the people of ancient Qin became. And the Sea of Heavenly Demons today is the Yellow River of the Nine Provinces, which vanished without a trace all those years ago!”