Rei hated the lycan from the very moment he appeared in Na's life and even more after Na became infatuated with him. She looked happier, but it heightened her emotions and this cursed creature introduced her to hatred, vengeance, sadness and all negative emotions that she shouldn't have as a Serafim.
The lycan had opened the gates for those feelings, which in turn allowed Decratic to grow stronger, as he was the opposite of the Serafim, he was fed by her emotions. The more tainted the Serafim's heart became, the stronger he became.
Therefore, the lycan was no good news for the Serafim.
But somehow, after five hundred years, even after everything that Rei had done coupled with all of his efforts to make sure they would never cross paths in this lifetime, they found a way back to each other again. They shouldn't be fated together if the lycan brought nothing, but misery to her.
However, fate worked in mysterious ways.
