Ancient line: During the Chenghua period of the Ming Dynasty, Zheng He, the former eunuch, combined his navigation knowledge with Taoist secrets in his later years to create the first version of the "Sunflower Collection". However, before his death, he regretted it and wanted to destroy the book.
Modern line: Lin Mubai, a contemporary young man, a librarian who is confused about his gender identity, accidentally discovers the fragments of a book, and the two souls resonate across time and space.
