Veteran Li Yuanzheng was an ordinary delivery boy until one day he discovered that he could travel through China in different historical time and space. Every time it is delivered on time, it changes the past and the future - sending chicken feather letters to anti-Japanese war soldiers, sending life-saving medicine to scientists in Lop Nur, and delivering relief supplies to the Wenchuan disaster area. The deeper he travels, the more he understands: the warmth of this country is hidden in the running of every ordinary person. And when a crisis occurs in the parallel world and evil forces attempt to tamper with history, he will use his wheels to protect the choices of 1.4 Billion people.
