Please recommend a novel where the female lead is the second wife.

The male protagonist seemed to be a marquis, the husband of the female protagonist's cousin. The female protagonist's cousin was critically ill and wanted to choose a second wife from the family. The male protagonist took a fancy to the female protagonist, but the female protagonist's cousin did not want her husband to choose the female protagonist, so she joined forces with her mother to frame the female protagonist when she was offering incense. As a result, another sister was harmed. Later, this sister went crazy. The female protagonist's sisters were all used by the eldest branch. The female protagonist had a younger brother who brought his younger brother to the capital in order not to be threatened. The female protagonist had a younger sister who married into a scholarly family, but her marriage was not happy either. There was also a younger sister who was married to the maid's husband's subordinate. It wasn't that she couldn't remember the name of Zhizhi's Shu daughter guide, but she could still remember some details.