She didn't know why, she traveled through time several times, and came to this era where vampires were king. She was originally just a six-year-old orphan who had no one to love and no one loved her. When she came here, she met a vampire and "happened" to be saved by a pure-blood vampire. But because of the prophecy, she was kidnapped by people from other countries and became a witch respected by thousands of people.
In order to find her brother, she returned to that land, but when she found her brother, she met the most important person in her life. She has no memory, but she knows that she cannot live past the age of 18, otherwise the curse will be activated, which will make her life worse than death, but the price of lifting the curse is to kill herself...