外省老兵赵学平 (金士杰饰演) 以及高中夜校生阿宏 (张睿家饰演)，各自搭乘捷运在台北城里晃荡，度过苍白而混乱的一天。看似不相干的两个人，时时擦身而过，彼此有着似有若无的交集。直到夕阳西下，他们终于在城市的角落里相遇。在错综复杂捷运甬道里，那深埋了六十年的心事终于溃堤，牵引出一段从不为人知的凄美爱情故事…

Xue Ping, an out of town war veteran and Ahong a high school night school student both take the train to visit Taipei and wander around Taipei city, spending a strange and chaotic day. From time to time these two people's lives intersect. When the sun sets, they finally run into each other, stirring up the drama, and the revelation of a sixty year old sad and beautiful gay love story.