Princess For Ghost Marriage

Lu Yunxiu had been living in her aunt's house ever since she was a child and had suffered greatly. His aunt had designed him to marry into the Prince's Mansion to pay off the debts he owed to his aunt's family, and from now on, had she spent her remaining life like this? And on the day of her wedding, as a widow, she was actually with the eldest brother of the 'groom'! Was it an order or was it something else?