The year after Qin unified the six kingdoms, Ying, a soldier in the Bashu post station, discovered that heavy rains had washed away the plank road, and the official document required a 60-day detour. In order to save the people in the epidemic area, he took the risk of using the dangerous Qiang hunting trail and shortened the delivery time by pigeon relay to the 9th. However, he was sentenced to jail for "tampering with post laws". After being released from prison three years later, he discovered that the method had been plagiarized by the military, which even led to merchants using post roads to smuggle iron. Ying returned to the post road with his broken body, and took the initiative to expose the loopholes to the Rangers of the Six Kingdoms, triggering a conflict between the Qin court and the local area. In the end, the improvement of post roads was promoted across the country, and his name disappeared into the insect-eaten holes in the bamboo slips. Only a homing pigeon he domesticated flew back to the ruins of the old post every year.
