Vampire Is Brother

My name is Lin Lili and I am a forensic scientist at the police station. Picked up a seriously injured vampire in an alley on a rainy night. Her silver hair was stained with blood, and she was breathtakingly beautiful. I took it home and hid it in the attic, but I always felt that his eyes were familiar. "Don't be afraid." He whispered unconsciously in a coma, "Lily..." That's my nickname. When he woke up, his fingertips touched the crescent birthmark on the back of my neck: "Little Lily of the Valley, ten years." Is the person who appears again my brother? In the fog, can the truth of the story be found?