离家出走的藏族少年桑丹一心只想去塔尔寺学做酥油花，路上遇见从父母身边逃走的同龄人唐宇，两位少年结伴而行的途中遇见各种各样的大人，包括前来追寻儿子的唐宇父母。在这段旅程的终点，无论两位少年是否实现了心愿，都收获了更为重要的东西。
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