在北京打工的阿鑫，是一名电影编剧。为了生存，放弃了电影梦想，以给孤独的老年人们写人物传记为生。突然有一天，他接到远在家乡妈妈的电话，得知姥爷病重的消息。于是不得志的他，收拾行李回到家乡看望姥爷。在陪伴姥爷最后的日子里，阿鑫决定为姥爷写一部关于姥爷的故事。在写《姥爷本纪》过程中，姥爷用他的人生故事帮助阿鑫重拾梦想。 Xin worked in Beijing, he was a film script. He gave up his film dream, and he was writing the biographies of the old for his living. But one day, he got a message about his grandfather's ill from his mother's call. So frustrated Xin packed up and backed home for visiting his grandfather. Xin decided writing a biography for his grandfather's story when he took care him. And his grandfather helped him to restore his dream in the process.