Zhou Chen, a college student in the Department of Modern History, accidentally traveled to the Zhenguan period in the early Tang Dynasty and was bound to a cheating system that sometimes worked and failed to work. With advanced historical cognition and modern knowledge, he went from struggling to survive to establishing a foothold in Chang'an through inventions such as spirits, colored glaze, cement, and red bricks. He had a bad Buddhist character and was hard-spoken and soft-hearted. He was favored by Li Shimin but repeatedly refused to serve. However, he quietly used inventions, medical skills, and military skills to improve the Tang Dynasty. He met and got to know Princess Changle, the legitimate queen of the aristocratic family Xiyue, Luo Wumei, Princess Yuzhang, and Princess Ashina Katsuo of the Western Regions. The emotions of many female protagonists are intertwined. He joins the army to achieve military exploits, fights against aristocratic families, saves Empress Changsun, builds muskets and artillery, pushes taxes on farmers and mulberry merchants, and eliminates Goguryeo and Japanese troubles. From the commoner to the prince-in-law to the prince, the whole process focuses on the daily life of Zhenguan, accompanying Li Shimin throughout his imperial career. After the new emperor ascends the throne, he returns to seclusion with his beauty, leaving an open and happy ending.
