Modern courier Chen Yiming died suddenly after staying up late at night. He traveled back in time to the Yuanyou period of the Northern Song Dynasty and became the new stationmaster of Qingyun Station, which had been idle for three years. Relying on his modern express delivery knowledge, he pioneered the express delivery business in ancient times. Starting from one person, two horses, and three leaky rooms, he gradually developed into an express delivery network connecting all states in the Song Dynasty.