In 2008, during the last month of summer before high school begins, an impressionable 13-year-old Taiwanese American boy learns what his family can’t teach him how to skate, how to flirt, and how to love your mom.

一名爱国志士冒死刺杀日军参谋人员，将夺来的日军有关上海军事行动的机密情报藏身于“百年太岁”中，由章家父女将“百年太岁”秘密送往上海。到了上海，章家父女却离奇死亡，戏班学徒秦太岁无意间被卷入这桩凶杀案中，“百年太岁”落入上…

聚焦导演王湘圣83岁的外婆跟94岁的奶奶，性格迥异、热爱生活的两个老人一起过着普通而快乐的日子。