余非(李沁 饰)自幼生活在单亲家庭,她积极向上,善良且乐观,沒有通常单亲家庭成长起来的孩子那种偏执,母亲余玥(杨雨婷 饰)郁郁寡欢,为人冷淡,伹这并沒有使余非心中留下阴影,她始终一如继往地照顾母亲。生在富豪之家,娇生惯养的叶琳(阚清子 饰)自小被父母捧在掌心,爱使小性子。身份的悬殊并没有阻碍她与余非成为无话不谈的闺蜜。长大成人后,女孩的心思多了起来,特别是当叶琳发现自已钟爱的章赫凡(何润东 饰)心思在余非身上,心中涌起嫉妒之火。为报复昔日姐妹,她跟对余非始乱终弃的老公夏宇扬(张勋杰 饰),狼狈为奸,无所不用其极。就在这时,一个爆炸性新闻弄懵了她俩,原来她们是从出生就被掉包,同父异母的亲姐妹......Fei Yu is a lovely civilian girl with strong personality, she met a proud and arrogant rich girl Lin Ye, and became good friends. Inadvertently, Lin Ye found her fiance Hefan Zhang loves Fei Yu, because Fei Yu has rescued Hefan Zhang when they were young, that made Hefan Zhang more than unforgettable. Lin Ye thought that's all Fei Yu's fault, so she used Fei Yu's boyfriend to revenge. Unexpectedly, they found out Fei Yu and Lin Ye are half-sister.