“曉不曉得這裡為什麼叫天門？” 一個同根的家庭；一座變遷的村莊。 爺爺病情漸重，在城市長大成年的孫女陳安然聽從父親安排，回到陌生的家鄉天門接爺爺進城治病。 天門修建高速公路，爺爺的祖屋將遭拆遷，叔叔一直向老父親隱瞞狀況。勢力的嬸嬸屢次向叔叔施加壓力。 慢慢地，陳安然看到 爺爺在這片土地上一輩子的生活痕跡。而在此時，爺爺終將面對祖屋不保的事實。 "Do you know why the village is called 'Heaven's Gate'?" The land bears him life; He bears it with love. Heaven's Gate, once a tranquil village lies in the mountains, is now confronting the fate of being urbanised. Chen Anran, a girl who is raised up in the city, compromises to go back to the distant village to pick up her seriously ill Grandpa to receive treatment in the city. Meanwhile, a fact that a highway construction requiring to remove Grandpa's ancestral house reveals to the old man.