Xie Chengchuan, the young master of the Xie family, suffered a plot and became blind. His fiancée Lin Wanru broke off the engagement and remarried. In order to stabilize him, Mrs. Xie chose Su Tanyin, a maid with a similar voice to Lin Wanru, to marry him instead. On the wedding night, he was still covered with a cloth and called "Ru'er" in a low voice. Three months later, his eyesight gradually returned. The Xie family wanted to expel the "substitute", but found that she was pregnant. True and false identities, deep-seated plots and undercurrents in the court are intertwined. When the truth approaches, Su Tanyin must protect not only her status, but also the fate of herself and her children.