Vampires and werewolves are natural enemies, and the battle between them seems to have started since their creation. Although the two have the same ancestor, the undead, having the same clan does not mean they have feelings for each other. On the contrary, it is precisely because of the similar bloodline and strength that the two races have constant conflicts, ranging from competing for food, humans, to competing for territory. It is absolutely impossible to calm down the two tribes and negotiate amicably. At the beginning of the 14th century, the battle between the two sides became intense. Lucia, as a direct line of the werewolf ancestors, was the first to realize the free transformation of the werewolf body and the human body. He rescued a group of slaves from the blood nobles who were about to be sacrificed and became puppets, and gave them eternal life on the condition that they would always be loyal to him. Since then, the advantage in the war has gradually shifted from the vampires to the werewolves. The vampires were punished by God, their power was eliminated, and the clansmen were expelled to the Ice Castle and sealed by ice. After that, the vampires were about to embark on the road of destruction due to inbreeding and most of the nobles were wiped out in the holy war. The high priest received a prophecy that the grudges between the two clans would be settled by a hybrid, and he would lead the vampire clan to another glory.