HP: Turn the Ring and the Whole School Will Be in Chaos.

My name is Ivy Rozier White. My father Bai Heng, when he was young, no one in the Eastern magic world dared to offend him, but later he retired. My mother is the legitimate daughter of the Rosier family and the former deputy director of the Ministry of Magic. She severed ties with the entire family in order to marry my father. I inherited my mother's face, black hair and blue eyes, the only one in Hogwarts. When I was eleven years old, my dad gave me a silver ring: "It's waiting for you." I turned it, and a voice came out: "You finally turned it to me." His name is Donnell. Amnesia. I only remember one thing - to accompany someone for seven years. I asked him who he was waiting for, and he said: "... You." He is the most predictable person I have ever met: Malfoy was going to say "You did it on purpose" next - I said it before him, and he glared at me for three seconds; Filch still had ten seconds to turn - I just hid, and the light came on. He can become invisible: if I hold my breath for three seconds, I can disappear from the eyes of others. He will also tell you: There is no one in the classroom on the left, you can go around here and mess with him. For seven years, he did all the unkind things with me. Quarreling with Draco Malfoy in the corridor, making friends with Harry Potter, staring at Cedric until he didn't smile, competing with the Weasley twins to see who was crazier, knocking over Oliver Wood's broom, and telling Blaise Zabini in the corner of the library that "you are more interesting if you don't talk than if you talk". I thought I was here to go to school. Only later did I discover that the arc on the inside of the ring was a countdown. The Battle of Hogwarts, seventh year, is over. There are four words written on it. He has been waiting for me for a long time.