安史之乱，唐军西域主力回长安平叛，几千将士留下对抗周围几十万吐蕃大军。这支孤军死守西域四十二年，使之不能趁乱进犯长安。故事发生在公元790年，西域只剩下龟兹和西州两城。两地之间输送军费，但运款小队在半路与敌人同归于尽，一名流民在偷摸财货时，被之前晕倒的唐兵制服。于是，唐兵押解流民踏上了送钱的旅程，故事由此展开…

影片讲述了关于“三代人”、“七里地”的故事。为生存而来，为梦想而走，为寻根而归的贺岁短片。

As the new year approaches, Li Yubao is embarrassed when his three-year-old grandson is going back to the village for the holidays. The child wants a Peppa, but what is Peppa?