Which episode was identified by Liu Reqing and Yang Yuxuan in The Story of Laughter in the Medical Museum?

In the 22nd episode, Zhu Yipin helped the emperor solve the problem of ice poisoning and returned to Yiguang from his palace. Grandpa Cao from the East Factory and Grandpa Wang from the West Factory came to expose the identity of Liu Ruo Xinhe.

Laughter in the Medical Museum is a costume detective comedy, produced by Shanghai United Film and Television, directed by Ding, starring Jiang Yan, Zhang, Yuan Yuan, Li Jianren and Liu Mengmeng.

The play tells the story of a group of seemingly funny guys in Daming Capital, and together with a killer from the East Factory and the West Factory, they form a magical detective squad. They solved a funny story of suspense story together in Qixin. Five hundred years ago, in the Daming Capital, there lived a group of happy young people in a small light. One day, the owner of Yiguang Museum mysteriously disappeared, and disciple Zhu Yipin received a scroll. Inadvertently opened, his natural quick memory made him quickly read and write down the contents of the scroll, and then he fainted and the scroll burned to ashes. When the East Factory and the West Factory knew about it, they sent their masters Yang Yuxuan and Liu Rexin to go undercover, trying to find out the secrets on the scroll. By mistake, they and Zhu Yipin were involved in a bizarre case. The entry of new people also broke the previous calm. Liu Ruoxin is young and beautiful, tall and handsome, and both Zhao Buzhu seem to be attracted by Liu and deliberately want to associate with him. During this period, Yang Yuxuan's ex-girlfriend and deputy security officer Ziyi Nie also came in to stir up trouble, and countless possibilities quietly fermented in a small light. Zhu Yipin's Yiguang detective team began an adventure, breaking through thorns and uncovering mysterious and shocking secrets.