She is "Lin Siyan", an ordinary high school girl. She was kidnapped when she was a child. Her parents searched hard for her. A year later, just when they concluded that their daughter was dead and completely despaired - Lin Siyan came back! "I don't know what happened, what year is this?" This was the first sentence Lin Siyan said. Her parents took her for a physical and mental check-up, but found nothing wrong. Later, she barely kept up with her studies and entered "Jinding High School". However, the darkness caused by all kinds of people and everyone's different pitiful backgrounds surrounded Lin Siyan. In the end, she found that she only had scattered memories of her childhood! When faced with things, Lin Siyan would actually make unexpected moves! Even... The mechanisms in her house... What are the answers to each of these puzzles? Who is it? Lin Siyan was horrified, who am I?