He and he both died in the holy war between humans and vampires eight hundred years ago.
He used forbidden spells on him, causing him endless reincarnations, repeating life and death countless times in reincarnations.
Riddled with wounds, he wanted to end everything eight hundred years later.
With no memory left, eight hundred years later, he only had the desire for revenge.
His sword pierced his own heart, and his tears burned his lover's chest.
He said, I have locked you in my heart, there is no solution.