Yang Ruyi (32), a fashion magazine photographer, lives with her elder sister Yang Ruxing (33), a rational, introverted detective fiction author. Ruyi has inadvertently photographed a couple making madly passionately love. Few days later in a shopping center not far from her home, she finds the woman already married, leading a child and is with a different man. Ruyi shares her secret with Ruxing who is suffering from writer's block. The two sisters begin to observe the couple; gradually Ruxing even writes some of her observations into her novel, without letting Ruyi knows it. Late one night, Ruyi views two people are arguing, but as she picks up her camera to photograph she can only see two vague, dark outlines wrestling one another; Ruyi calls the police but upon arriving, nothing seems out of order. Ruyi is convinced she has mistaken nothing; she enlarges the photo and discovers a third outline looks pretty much like her older sister...
一幢公寓，姐妹俩分住楼上楼下。姐姐如行（朱芷莹 饰）是个作家，妹妹如仪（张均甯 饰）则是一个摄影师，二人终日为自己的事业忙碌，生活波澜不惊。某天，如仪无意中抓拍到一对男女欢愉的画面，后来发现那个女人在背着丈夫偷情，这令她的好奇心陡然而起，于是刻意探究这个女子的生活。如仪将这段经历告诉姐姐，由此也引起如行的兴趣。适值如行遭遇创作瓶颈，她决定将这段偷情故事写入小说。但是如仪偶然发现，姐姐小说中的情节似乎正映射了那对男女未来几天的经历。她察觉到姐姐对自己有所隐瞒，而这对姐妹也不可避免地开始影响到那对陌生人的生活……
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