Great Tang: Little Sizi's Life in the Future

Originally titled The Tang Dynasty: Xiao Sizi and the City of the Future

Li Kuan, from another technologically advanced timeline, is reborn in the Zhenguan era.

With the backing of a highly advanced civilization, Li Kuan builds a city of the future in an uninhabited land. He had planned to stay out of this era's conflicts for good, but then he discovers that his younger sister from his previous life has also been reborn in this era. She is his half-sister, Li Mingda, nicknamed Sizi.

From then on, Li Kuan and his younger sister enjoy a carefree, futuristic life in the Tang dynasty.

Only when the city of the future he built appears before the Tang imperial family does Li Shimin understand what the future truly means.