The earliest time was to return to Zhao in good condition, from the Spring and Autumn Period and the Warring States Period. Around 300 BC, Lin Xiangru of Zhao was determined to cross the rubicon again. Around 200 BC, Xiang Yu attacked Qin Jun and then visited the Caotang. The story of Liu Bei's invitation to Zhuge Liang to come out of the mountain is about 184 to 280. Finally, he said that Li Bai was almost halfway through his studies when he was young, and he met an old woman who was grinding noodles.

The order is: return to Zhao in perfect condition (Warring States Period), cross the rubicon (Late Warring States Period), visit to Caotang (Three Kingdoms Period), and get a needle with an iron pestle (Tang Dynasty).