In an old alley in Ningbo in the late autumn of 2015, Chen Yan, the owner of Yantang Bookstore, unexpectedly received an iron box left by his lover Shen Nian, who had been missing for five years. It contained an encrypted ledger and half a rubbing of "Lanting Preface". In order to uncover the truth about Shen Nian's disappearance, he followed the clues and uncovered the conspiracy of the cultural relics smuggling gang headed by Lu Song. They forged ancient books, replaced genuine museum items, and imprisoned Shen Nian who discovered the secret.
From the thrilling confrontation in the warehouse on Mochi Street, to the excavation of cultural relics at the Yunlong Mountain Grottoes, to the decryption of the code of the old house on Pingjiang Road in Suzhou, after Chen Yan and Shen Nian reunited, they joined hands with righteous people such as Lao Wu and Director Li to gradually approach the core of the "Mo Shadow Organization". Faced with the pursuit of foreign forces and the betrayal of traitors, they relied on their familiarity and persistence in ancient books to resolve crises time after time. They vowed to protect precious cultural relics such as the Song Dynasty military defense map and "Spring and Autumn Dew" and prevent them from flowing overseas. This battle between good and evil surrounding ancient books not only hides deep feelings spanning five years, but also carries the mission of protecting cultural heritage.
