Faced with the task of creating a film about first love for his producer Wong Kar-wai, Kot ruminates on his creative process, his rejected ideas, and finally his two chosen tales, about a sleepwalker guided through the night by a lonely admirer, and a married convenience store owner faced with the vengeful first love that he once rejected.

琪琪（周秀娜 饰）在一个礼拜后就要与恋爱七年的警员男友阿泽（罗仲谦 饰）结婚，在几个好友的聚会上，琪琪偶遇摄影师JACK（沈志明 饰），并在酒后与其发生了一夜情，追悔莫及的琪琪欲迅速终止这段关系，然而第二天二人再次相遇，在好友的怂恿下，琪琪等人与JACK同看演唱会，当夜琪琪意外发现了阿泽偷情的表徵，遂拉上JACK一起捉奸但一无所获，后者在离去时邀请琪琪在结婚前陪自己再度三天；另一边，执行任务的阿泽与街头女孩阿宝（杨梓瑶 饰）调换了手机，从未有过背叛女友念头的阿泽自此落入了一段短暂又不可思议的关系。马上就要结婚的二人，走上了各自的爱情岔路……