The Proud Fiancée of the Sickly Prince

It was only when Yunxi and Jiji learned that she was engaged, but no one told her who her fiancé was. Until one ordinary afternoon, when she was lying in the boudoir, disaster came from the sky. Her stepmother slapped her and accused her of murdering her fiancé. Lord Qingtian! She was really unjust. She didn't even know who her fiancé was, so how could she have the chance to take action?