Li Shande, a minor official in Chang'an City, suddenly received a task: to transport fresh lychees from Lingnan before the birthday of the imperial concubine.The lychee % color changes in one day, the fragrance changes in two days, and the taste changes in three days. Lingnan is more than 5,000 miles away from Chang'an, and the mountains and rivers are far away. This is an impossible task, but for the sake of his family, Li Shande decided to give it a try.After arriving in Lingnan, Li Shande raced against time to find ways to preserve freshness and optimized the transportation path.The birthday of the imperial concubine is approaching, and the transportation of lychees is about to begin. Li Shande knows how exhausting the delivery of this small lychees is. He has a plan in his mind. This plan concerns his life, everyone who has been with him along the way, and more importantly, the people in the world.