Around the beginning of 1900's, Jiang Yu met Wu Cai Hong and was attracted by her kindness and beauty. He unwittingly discovered she was the daughter of his enemy, and her father sudden death made him the primary suspect. Their path crossed in an effort to find the truth. The closer they worked together, the deeper their mutual attraction, and the harder they hid their feelings. Will the truth give them the permission to love, or will it be their end?

故事发生在清末民初，湖州织染巨头江余（刘恺威 饰）在一次偶然中同名叫彩虹（郑爽 饰）的少女相遇，彩虹的单纯和善良让江余感到十分心动，然而，彩虹是吴宏达的女儿，而吴宏达恰恰饰江家的世仇，无奈之下，江余只能将这份感情默默埋藏在心底。 彩虹的家里遭遇了变故，父亲不幸离世，彩虹认为这一切的罪魁祸首正是江余，她决心潜伏在江余身边，调查处事件的真相。为了将彩虹留在身边，江余威逼利诱，最终使彩虹成为了自己家用的佣人，尽管两人之间矛盾重重，但随着时间的推移，炙热的真心渐渐浮出水面，打动了彩虹，这一对苦命鸳鸯最终能否走到一起？