I can recommend to you " The Contract of a Wealthy Family: The President's Spoiled Wife." The female protagonist of this novel also brought her child back to her ex-husband's house. Although it was not an ancient palace, it was similar to the status of a concubine. In the story, the male protagonist was the CEO of a wealthy family. He signed a contract marriage with the female protagonist. Although it was purely for the sake of the family's image at first, the male protagonist gradually fell in love with the female protagonist and her child, and they started an unprecedented marriage. I hope you will like this novel.