Episode 18 recap: Li Mengjue and Xie Jingshu had a conflict.

Li Mengjue noticed that Lu Xier seemed hesitant to speak, and just as Lu Xier was about to say something, Xie Jingshu held a sword to her neck. Liu Yu'an hurriedly came to explain that Lu Xier was actually a good person. Liu Yu'an told everyone that Lu Xier had saved her life before. Li Mengjue firmly believed that Lu Xier must have had her reasons and resolutely took Lu Xier away.

Lu Xier took the initiative to confess that she had secretly hidden some clues while handling the case. Lu Xier had been having nightmares every night, and she voluntarily told Li Mengjue and others that she was the "Xue Shang Yizhihao" (a solitary Artemisia plant in the snow) and had been studying pharmacology and poison since she was sensible, all in the hope of one day having the opportunity to enter the Great Zhao. "Xue Shang Yizhihao" was not just one person, but the mission of many saintly women.

Lu Xier felt that she should have lived in the sunshine and had a family who loved her, but the war pushed her to the dark edge. Since infiltrating the Great Zhao, she had become a pawn. She knew that Du Shaoqing wanted to come here to defeat the Great Zhao, and she had been secretly preventing it. Jing Yan wanted to persuade Lu Xier to stay. Even after some things were exposed, Lu Xier felt ashamed to face Li Mengjue and left.

Li Mengjue was very sad and afraid that Xie Jingshu would die like this, leaving no one to prove the innocence of her loved ones. Xie Jingshu had a heavy heart, and Liu Yu'an couldn't understand, while Jing Yan thought that Xie Jingshu was acting strangely today.