In the prosperous age of Chang'an, A Ning, a female official in the Imperial City Book Pavilion, has a pair of eyes with a photographic memory, and her world is composed of thousands of books. A broken bamboo slip accidentally discovered caused her to fall from a peaceful study into a fugitive world. The forbidden techniques of the previous dynasty recorded on the bamboo slips led to the mysterious murderous intention of the "Shadow Society". They pursued him like phantoms, trying to use the secrets on the bamboo slips to shake the foundation of the entire empire. Fleeing between the prosperity and darkness of Chang'an, A Ning discovered that this was not only a duel between her and the film club, but also a battle to protect historical truth. According to legend, the "Underground Library" looms, hiding the ultimate secrets of the empire. Before she is completely wiped out and forgotten by history, she must use her memory as a boat and wisdom as an oar to sail towards the final truth.
