Episode 39 recap: Yan Nan Xing chose to leave and transform.

Yan Nan Xing did not expect the young lady in white to do this, and was also surprised, but still put on the young lady in white's clothes and came out. A guard stopped Yan Nan Xing, and Yan Nan Xing was very nervous, but the guard said that she had dropped something and handed it to Yan Nan Xing. Yan Nan Xing was relieved and quickly left.

Prime Minister Pei came to see Yan Nan Xing, and the young lady in white pretended to be Yan Nan Xing's transformed self, trying to deceive Prime Minister Pei, but Prime Minister Pei still noticed it and directly killed the young lady in white.

Yan Nan Xing followed Jiang Suo Luo into the palace. Jiang Suo Luo asked Yan Nan Xing if she was afraid, and Yan Nan Xing said that since she had come this far, what was there to be afraid of? They were stopped by the gatekeepers, but fortunately the Empress arrived in time to help them and brought them inside.

The Empress had the guards around the Emperor dismissed, and let Yan Nan Xing examine the Emperor. Yan Nan Xing said the Emperor was indeed poisoned by the taxus poison, and she used her own blood to detoxify the Emperor. The Empress was surprised, and Jiang Suo Luo said he trusted Yan Nan Xing, and the Empress also gave her a chance.

Yan Qing Yun and Shang Bie Li gathered their brothers to protect the Emperor in the palace. Yan Qing Yun said they no longer had official positions, and following them might be considered treason, but their brothers were willing to risk their lives with them. They brought the brothers to the palace, but were stopped by the guards. During the chaos, Shang Bie Li snuck inside.

Prime Minister Pei came and ordered the Empress and the others to be arrested, saying he now had the Emperor's token and would be the Emperor. He then brought Yan Nan Xing over and made her drink the medicine her mother left her.

Yan Nan Xing's mother gave him the medicine and said that it was missing one key ingredient. If Yan Nan Xing drank it, he might never be able to change back. Yan Nan Xing transformed into an old woman, and Prime Minister Pei witnessed this change with great emotion.

When Jiang Xin Bai found out that Yan Nan Xing had been taken away, he rushed over immediately. He confronted Prime Minister Pei, allowing Yan Nan Xing to slip away in the commotion.

Jiang Xin Bai saw Yan Nan Xing from a distance, but wasn't certain it was him. Someone then came to tell Jiang Xin Bai that the Emperor had summoned him, so Jiang Xin Bai had to leave first. Yan Nan Xing wasn't sure if he could change back, and didn't want Jiang Xin Bai to see him in this state.

The Emperor no longer had any issues, and instructed Jiang Xin Bai and the others to thoroughly investigate Prime Minister Pei's actions. Jiang Xin Bai suddenly fainted due to his poor health, and the imperial physician came to treat him. Jiang Xin Bai's mother was very anxious, and asked Yan Qing Yun to send people to look for Yan Nan Xing.

When Jiang Xin Bai regained consciousness, he found that he could now see people's faces clearly, which delighted his mother. They discovered that Yan Nan Xing was missing, but Jiang Xin Bai's mother assured him that they had already sent people to search. Jiang Shuo Luo said that Yan Nan Xing also cared deeply for Jiang Xin Bai, and would surely return soon.

Jiang Xin Bai went to Yan Nan Xing's residence and Hua Xiang Rong's place, but found no sign of Yan Nan Xing. Reminiscing about their time together, Jiang Xin Bai deeply missed Yan Nan Xing, and played a melancholic tune on the city wall.