The Song of Rebirth Is Wrong

Before rebirth, the heroine married the hero but inadvertently caused the death of the hero's beloved. She lived with the boy for three years and was finally pushed into the water by her sister and died. Her soul was imprisoned in the Hou Mansion for unknown reasons and had to be helped by an expert. After rebirth, she wanted to avenge herself, but she felt indebted and decided to give up the relationship in her previous life.