周繼薇本來應該叫做「周繼偉」，是老媽一雪前恥的希望！

但，當她呱呱落地之後，希望幻滅了，她那被賦予獨一無二的「貴子」命運，卻瞬間變成了「周家第三個女兒」。所以她只能穿前頭兩個姊姊的舊衣服、暗暗嚮往著永遠分不到的魚眼睛――因為一隻魚只有兩隻眼睛、一隻雞也只有兩隻腿，因此「第三個」的意思，就是多出來的那個。

但，多出來的周繼薇，卻深獲鄰居戴奶奶的喜愛，於是，她總是離家出走、直奔戴家的懷抱。在好乾淨、好舒服的戴家，她是一個被愛包圍的小公主，還有一個帥氣的小哥哥「戴耀起」――雖然，戴耀起根本不想有一個妹妹來跟他分食人間美味「魚眼睛」。

想盡辦法要變成戴耀起的妹妹的周繼薇，終於在17歲那年，發現了一個連自己都不知道的秘密――她不需要永恆、也不需要美麗的愛情樣子，她只想要永遠跟戴耀起「一起」。

在还没有出生之前，周继薇的身上便背负了沉重的枷锁，在连续生了两个女儿之后，周继薇的母亲将生儿子的希望全部寄托在了腹中的胎儿身上，于是，在呱呱坠地的那一刹那起，这个女婴的命运便注定不会轻松。

随着年龄的增长，周继薇在家中不受重视的事实就越发明显，生活中只能穿两个姐姐淘汰下来的旧衣服，饭桌上亦要让两个姐姐做优先选择。幸运的是，活泼可爱的周继薇获得了邻居老人的喜爱，她的大部分时间，是和这位慈祥的老人共同度过的，而她的生命中，也因此多了一个没有血缘关系的“哥哥”戴耀起，当这份亲情随着时间的流逝而渐渐产生了微妙改变之时，周继薇和戴耀起要共同面对的，是一个被埋藏得很深很深的秘密。

The Zhou family has high hopes in giving birth to a son but was disappointed when Zhou Jiwei was born a girl, making her the third daughter in line. Because she was a disappointment to the family, she was only ever given hand me downs from her sisters. She felt no love from her family, but luckily she feels the love of a family from her neighbours. There she meets her 'brother' Dai Yaoqi and follows him around trying to be the best sister ever, however, he has never wanted to have a sister. As she tries her best to be close to him as his sister, she slowly realizes the feelings she holds for him are not love for a brother but something more.