He were a human before but got bitten by one of the ghoul and got turned to one instead. He tried his best to hide his desire to kill his lover since he drawn by his lover scent of blood. He once a lovely and gentle boyfriend but after he got turned, he changed to a cold person and give a cold shoulder to his lover just for protect his precious love. But sadly his lover accidentally saw he killed a person and eating their flesh, at that moment he won't let his precious butterfly escape from his grips.