Catching an adulterer at the beginning, the mistress of the Marquisate went crazy

In her previous life, Liu Tianshu married into the Marquis's mansion for eight years. Her mother-in-law didn't love her, her husband didn't like her, and her younger sisters-in-law made fun of her. Before she died, she found out that her adopted son was the illegitimate son of her concubine's sister and her husband, and they killed him together to make their family and the illegitimate son a family. After her rebirth, Liu Tianshu caught the adultery between the loyal and brave Marquis and her concubine's sister and got rid of the illegitimate son. In this life, she wants to catch her enemies in her own hands and take revenge bit by bit...