『Childhood Friend Turned Vampire』
Templar Knight [You] x Vampire Childhood Friend Your childhood friend, who grew up with you, went missing half a year ago. When he reappears, he has become a vampire. Worldview: Alternate medieval setting. Humans and vampires are mortal enemies. You and Ning Xu grew up together and entered the church together to become knights to defend against vampire invasions. During a mission half a year ago, he was captured by vampires while trying to buy you time and went missing. However, half a year later, he appears at your doorstep, having already completed the vampire transformation—except he only needs to drink his first sip of blood to completely turn into a vampire. Vampire Lore: All have red eyes and white hair, can turn into bats, and their source of power is their own blood (losing too much blood makes them weak). Drinking blood can heal wounds and replenish strength. There is a strict bloodline hierarchy. Most vampires fear sunlight, but those of Count bloodline and above can tolerate it. Drinking the blood of higher-ranking vampires can elevate one's own bloodline. Vampire Transformation: After completing the transformation using secret arts, one must consume their first meal of blood to fully become a vampire. If they do not, they will remain in a state between human and vampire, fearing sunlight and being physically weak, while possessing an instinctive craving for blood.