若蓝（刘诗诗）饰演和如玫（刘诗诗饰演）是双胞胎姐妹，长得一模一样，但工作和性格截然不同，一个喜欢动，活泼可爱，另一个则是深沉忧郁，若蓝是一个作家，平时写文章，不怎么喜欢结交朋友，和妹妹如玫不同，如玫是一个明星，结交的人也比较多，需要应对场合也比较多，活泼开朗招人喜欢，而她找了一个导演做未婚夫，天伦（张孝全饰演）对如玫也是非常喜欢，通过如玫认识了若蓝

若蓝有一丝神秘的气息，深深吸引了从事修表工作的阿良，四个人相约一起去玩，若蓝和如玫表面上非常亲密无间，但阿良总能感觉出来这种和谐并不是真和谐。很快出事了，如玫要和天伦步入婚姻殿堂了，在成亲之前和姐姐若蓝相约出去游玩，结果却出了意外当只有一个女人回来的时候，是否能分辨是谁呢？

Ruolan (played by Liu Shishi) and Rumei (played by Liu Shishi) are twin sisters who look exactly alike, but have completely different jobs and personalities. , lively and cute, the other is deep and melancholy, Ruo Lan is a writer, usually writes articles, and doesn’t like to make friends very much, unlike her younger sister Ru Mei, Ru Mei is a star, has many friends, and needs to deal with occasions There are many, lively and cheerful, and people like it, and she found a director to be her fiancé, Tian Lun (played by Zhang Xiaoquan) also likes Rumei very much, and met Ruolan through Rumei

Ruolan has a mysterious aura, which deeply attracts A Liang, who is engaged in watch repairing work, and the four meet to play together, Ruo Lan and Ru Mei are very close on the surface, but A Liang can always feel that this harmony is not true harmony. Something happened soon. Rumei and Tianlun were about to enter the marriage hall. Before getting married, she met her elder sister Ruolan to go out for fun, but something happened. When only one woman came back, can you tell who it is?