She was originally the youngest princess of Nan Qi, and she should have been favored. However, when she was born, Nan Qi was destroyed. Her mother named her Xiao Ruoyuan, just hoping that she would "never regret it because of this fate, and she would swim in the dark, if there was an opportunity." By some mistake, she and her sister Yun Shu were secretly taken away. She should have lived a carefree and happy life, but hatred blinded her eyes. Xiyin is the name of her new life. As a qualified killer, her perseverance has been tempered since she was a child. She can no longer feel any emotion. The betrayal of her master, the disapproval of her relatives, and the hatred of her lover. Where should she go?