A piece of ancient jade has been treasured by the Su family for generations, though no one knows its origins. It was actually a personal keepsake bestowed by Emperor Taizong of Tang, Li Shimin, upon his crown prince, Li Chengqian.
One night, as Li Chengqian sat lost in thought with the jade pendant in his hand, he accidentally crossed a thousand years of time and suddenly appeared in the home of a modern teenager, Su Yanzhi.
Past and present collide across a rift in time. Su Yanzhi discovers that the pendant is a link between two worlds, able to send modern supplies, knowledge, and equipment to the Tang dynasty.
To help Li Chengqian secure his position as crown prince, and to aid Li Shimin in building a golden age, Su Yanzhi uses the pendant to travel between past and present, bringing the Tang dynasty aid in the form of supplies and knowledge far ahead of its time:
He dismantles the deeply entrenched aristocratic clans, quells border threats, and crushes foreign invasions, rewriting the course of the Tang dynasty and forging the legend of an unprecedentedly powerful empire.
The Ming Dynasty Reborn: At Three Years Old, I Ascend the Throne and Become Emperor
Clouds of Smoke over the Flourishing Tang Dynasty
Hunting: A Million Armored Soldiers, and You Call Me an Ordinary County Magistrate?