Li Shande, a minor official in Chang'an City, suddenly received a mission: to transport fresh lychees from Lingnan before the imperial concubine's birthday.The color of lychees changes in one day, the fragrance changes in two days, and the taste changes in three days. Lingnan is more than five thousand miles away from Chang'an and the mountains and rivers are so vast. This is an impossible task, but for the sake of his family, Li Shande is determined to give it a try.After arriving in Lingnan, Li Shande raced against time to find ways to preserve freshness and optimize transportation routes.The imperial concubine's birthday is approaching, and the transportation of lychees is about to begin. Li Shande knows how laborious and costly it is to transport these small lychees. He has a plan in his mind. This plan is related to his life, to everyone who is with him along the way, and to the world.common people.