In which episode did the emperor take Zhen Xuan from a nun to the palace?

Episode 55 (The Emperor decides to welcome Zhen Xuan back to the palace)

In order to return to the palace smoothly, the emperor decided to change his surname to Niu Zhilu, named Fei, and called her the biological mother of the emperor's fourth son, so that Zhen Xuan could return to the palace.

Episode 60 (Back to the Palace)

Guo Ziyu county personally brought Zhen Xuan back to the palace. After returning to the palace, Zhen Xuan was very honored to live in the luxurious "Yongshou Palace".

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