In the troubled times of the late Sui Dynasty and early Tang Dynasty, who should we protect? Is it Li Shimin who is destined to belong to him? Or is it his confidant Li Jiancheng?
Zheng Qi, who had just been eliminated by the special forces, was sadly deceived by his sister Zheng Que into using the "time shuttle" to fly over. The reason was actually because he wanted to find his soon-to-be brother-in-law Dou Dou. Within a hundred years they penetrated three times and four times. Met Li Yuan, Li Jing, Yang Guang, Chang Sun Sheng, Li Jiancheng, Li Shimin...
Finally, when they traveled through time again, they sadly found that the instrument was broken and no one was found. The two siblings stayed in the Sui and Tang Dynasties and could not go back...