An ordinary Chinese girl was brought to London in the 19th century by a white piano when she entered a musical instrument store. She was inexplicably mistaken for Miss Trancey. Later, she found out that it was the elf Xiaolan who was responsible. As time went by, the girl's memory was slowly opened, and she realized that she was Miss Trancey. She came to the future China to help Xiaolan. In the end, which one will she choose to stay or go?