Yun Buqi, a logistical security staff of the scientific expedition team, came to the Zhenguan period due to an archaeological accident. He was forced to impersonate his ancestor "Yun Ye" and began to live in the Tang Dynasty. By chance, he met Li Anlan, the daughter of the Mohist school, who looked like his deceased girlfriend Xiao Ran, and became entangled with her. He used modern skills to repeatedly save Li Anlan and others from danger, became a close friend of the crown prince Li Chengqian, and was appreciated by the hero of the early Tang Dynasty, Cheng Yaojin and others. However, he was inadvertently involved in a huge conspiracy carefully compiled by the powerful official Hou Junji. How should Yun Ye, who got the Tang Dynasty script, choose in the torrent of history?