Counterattack of the Princess

In her previous life, she had been taken care of by the Lu family's mother and son, and ended up in the hands of Prince Gong. After her rebirth, she worked hard to change her fate. 
First, she kept her distance from the Lu family, protecting her mother and her family's property. She'd thought that with the identity barrier of the duke's daughter, she'd be able to peacefully marry into a good family. She did get married, but how did Prince Gong become her brother-in-law? King Luo Qing's character was good and everything of his was good. It was a pity that he was born with six fingers, which was an ominous sign. He could defeat the new emperor who had ascended to the throne and protect his little wife …