2019 has ushered in the 11th Double 11 day, which means China's 3 million couriers are also experiencing their busiest time of the year. One of them is Zhen Jie, who works for ZTO express. The company is about to deliver its 10 billionth parcel of the year. Zhen's job is labor-intensive. During the Double 11, he will be working very hard with the other couriers to make sure that all parcels are delivered to the customers as soon as possible.