In the twenty-third year of Kaiyuan (AD 735), the Tang Dynasty reached its peak. As the largest city in the world at that time, Chang'an City gathered businessmen, scholars, monks and artists from all over the world. However, beneath this bustling surface, undercurrents of political struggle, religious conflict, and technological change are quietly surging. The protagonist of the story, Chen Qingyan, is the only son of a wealthy businessman in the west city of Chang'an City. He has been extremely intelligent since he was a child, proficient in poetry and calligraphy, and full of curiosity about emerging technologies such as astronomy and gunpowder. By chance, Chen Qingyan rescued Yang Yuhuan's personal maid Mingyue, and was thus involved in the struggle for palace power. He gradually discovered that every move he made was closely related to the fate of Datang. Through his perspective, readers will witness the glory and decline of the Tang Dynasty and feel the insignificance and greatness of individuals in the historical torrent.