The Krystallos of Regan

Regans are dangerous , mysterious , and powerful , same as the Vou're's. These are the two clans who hates each other because of an unknown reason. Then one day these young man and woman met and they are the ones who'll change the present and finish this unstopable war of two clans. Who do you think is the reason behind this 'unknown reason' of the two waging clans? How do you think this story will end? Will it be in happy ending? Or....In a tragic ending? Come and join the characters in this long story I made!