Regine, a psychologically fragile young woman, is hiding away in the city, far from the dark and forbidding countryside of her traumatic childhood. She's struggling to construct the loving family she never had, and to rise above the events of the past: above all, the disastrous home birth of her brother Isaac, which led to her mother's insanity and Isaac's apparent death. But t...。故事围绕一枚被遗落在捷运车厢里的订婚戒指展开。原本应该是奕之向丽莎求婚的浪漫日子,但戒指却被奕之弄丢了,求婚计划可能因而被打乱,寻回戒指的过程中,他们开始重新审视爱情对彼此的意义到底是什么?另一方面,这枚戒指也开始流浪在这个城市中,随着捷运匆匆穿梭,经过一站又一站,也串起一段又一段的爱情故事。。