In a world where devils exist with a truth that they can never defeat God, an unbreakable yet forbidden love story emerges from the two prime beings of the devils and the Holy Tree Clan. Crystal our main protagonist raised in a life of luxury and strict conduct finds herself and cousin entangled with the two rival sides. Left to continue her mother's unfinished business, she finds herself knowing more about herself and the secrets kept by those close to her. In the end, the romance of ancient time surfaces back in modern daytime.