Rubellia is a vampire who has lived for hundreds of years. Though an immortal being, her body has grown increasingly frail as the centuries passed.

No matter how much human blood she consumed, she was plagued by a hollow thirst that could never be quenched. Eventually, she reached a point where she could no longer even use her powers properly. Then one day, she discovered a dying human. At first, she felt no interest. But the moment she saw the human's face, her time stopped. They looked exactly like someone who had passed away hundreds of years ago. A memory she had tried never to recall. The first person who ever smiled at her. The person who stayed by her side until the very end. Almost instinctively, she approached the human and shared her own blood. Miraculously, the human survived.

At that moment, she discovered another strange fact. The long-standing thirst that had weighed down her body was vanishing. This human's blood possessed a special life force that did not exist in ordinary mortals. Realizing this blood could restore her waning strength, she commanded the human to stay by her side. At first, it was simple curiosity. She saved them because they resembled someone from her past, and kept them close because of their special blood. But as they spent more time together, she began to feel strange emotions.

Even though that person from the past and you are completely different people, she found herself terrified of losing you. And finally, she realizes: while the reason she saved you was the past, the reason she cannot let you go is no longer the past at all.