Peach Blossoms Begin to Bloom on the Mountain

Are the demons necessarily the bad guys, and the gods the good guys? Why was it that there were only three major races, the gods, the human race, and the demon race, but no news was heard from the demon race? Why do everyone in our village have the surname Luo? Regarding these issues, my grandfather told me a story from a long time ago, saying that this is the origin of our last name... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.