Northern Chu and Southern Qi, the world is divided into two, and there are four ancient families hidden in these two opposing national capitals, and their common mission is the same, to protect the Book of Zhaoshi.

As the most hidden family among the four families, the mirror family has not been involved in world affairs for generations, and their ancestors have also made a rule that the mirror family is not allowed to enter the officialdom, and is not allowed to intermarry with foreigners, but can only hide in extreme concealment all their lives.

However, the Book of Zhaoshi is a treasure that everyone in the world wants to get, and the forces of each ghost have coveted this book for a long time, and the four families have paid a terrible price for protecting this book, this book must not fall into the hands of others in any case, it holds the laws and laws of the operation of all things in the world, and it represents the future.

The ancestors of the Mirror family made a living from the music workshop, and the Mirror family was born with a talent for music theory, and they were extremely sensitive to the vibration frequency of any rhythm that existed in the air.

The Mirror family is tasked with guarding the map of the Library, which is the place where the Book of Chronicles is hidden, and it is located in the Deserted North that neither country can touch. In fact, the mirror family has never had a map since their ancestors, and they passed it on to their descendants in a method that only the mirror family can master, that is, the sound rhythm.

Jing Tong, the head of the mirror family, once burned the map, in order to better protect the library, he can't keep the map in the world, even if the mirror family is wiped out in the end, he must bury this secret forever. The children of the mirror family are born crying and shouting, but the reason why they cry is different from that of other children, because from the moment they are born, the most subtle sounds of everything in the world are filled with their ears, and they can only avoid the existence of controlling these sounds by slowly cultivating their ears in the back.

He once led the people of the Kagami family to the site of the Book Pavilion, and he built a special bell on the top of the book tower, which was made of a rare material from the deep sea, which was taken from the Tibetan Sea sound, an ore a kilometer below the South China Sea Weary Garden. The bell made from this ore is a very special existence. The sound frequency it produces is not indistinguishable between ordinary people and animals, this kind of audio is the most sensitive one of the mirror family, and only the mirror family can hear it. There is another reason for using Tibetan Haiyin to build bells, that is, the loss of sound propagation, the sound produced by Tibetan Haiyin is regenerated in a way of cross-regeneration in the process of propagation, just like the sound will inevitably fail when propagating in the air, and the audio transmitted by Tibetan Haiyin will continue to cross-collide and regenerate in the air, so the consumption of the sound produced by itself is very small. In order to keep this secret, the Jing family will choose the inheritors of the past generations to practice the distinction of this rhythm, and this generation of inheritors is Jing Dongzhu.

The book tower is located in the north of the barren, every late autumn or cold winter, the wind of the north will blow the bell at the end of the tower, and the sound can be transmitted thousands of miles away with the help of the wind, and in other seasons, this rhythm will become extremely weak, so the mirror family can only find the location of the tower in late autumn or cold winter.

Although the four major families jointly guard the Book of Legends, each family knows that the information of this book is completely different. The other three families know how to use the book, the Chinese characters of the book, and the method of opening the book tower.

The Shen family and the Mirror family went to the location of the book tower, and they helped the Jing family open the book tower and install the bell. But their actions aroused the suspicion of another family, this family's power is the largest among the four clans, and their ambition is also the greatest, they have the use of this book, anyone knows that you can easily control the world with this book, and this cooperation between the two families has made this family suspicious. They believed that the two families had taken the book for their own and handed it over to the Mirror family for safekeeping, so the feud between the four families began......