Blood within a Rose that's Fair and Sweet

In the life of a young woman, who months later falls in love with a demon with a human appearance possessing extraordinary powers. But their faith had come to an end due to an unforeseen presence hidden within the shadows. A millennium after, time began to become dull and lifeless without his loved one. Although all seemed to be dark and hollow, faith had once more given them a chance. For their paths crossed, and all had appeared to be right in their world again. Even so, the unforeseen presence had come back stronger than ever. Will the lovers finally archive their happiness? And if so, who was the shadow that brought about their demise, and will its soul finally have peace?