Episode 21 recap: She is the last chess piece.

During this time, Yun Jiao has been closely observing the actions of her father, the Duke Zhen Guo, in order to help Mu Rong Cang investigate the truth. By chance, Yun Jiao discovered a secret chamber in the courtyard where the Duke Zhen Guo would sneak in when nobody was around. In fact, in the past, the Duke Zhen Guo's sister was the empress. However, because she gave birth to a princess and wanted to protect the empress, she took away the son born to the Shu Gui Fei and he eventually became the current emperor.

Mu Rong Cang's father, who was the imperial physician at the time, knew about the whole incident, and that's why the Duke Zhen Guo killed everyone from the Mu family. However, the Duke Zhen Guo's sister felt extremely guilty and chose to commit suicide. The Duke Zhen Guo also adopted Yun Jiao, but now Yun Jiao has lost her childhood memories. In reality, she is Xue Qing.

Although Xue Qing changed her name to Yun Jiao, she now protects her niece as if she were her own daughter. After seeing the Duke Zhen Guo emerge from the secret chamber, Yun Jiao quietly went to the study, as if all the memories were unfolding before her eyes. The bracelet that Yun Jiao wears was also left behind by her mother, who chose to commit suicide so as not to become a pawn in her brother's political game.

Mu Rong Cang found the emperor and hoped that Yun Jiao would not be involved in this matter, but the emperor was furious. Since she has already been involved, no one should expect to get away. After all, they have more important matters to attend to, and personal relationships between their children are not to be taken too seriously. Yun Jiao arrived at the Changsheng Shrine, thinking that as long as Mu Rong Cang avenges his family, they can leave smoothly.

At night, Yun Jiao thought that the person who had come was Mu Rong Cang, but to her surprise, it was the emperor.