In which episode of Love Apartment 3 did Tang Youyou play the maid of honor?

That was in the fourth episode of Love Apartment 3.

Plot:

Tang Youyou finally received a drama of the Qing Dynasty. She came to the crew to meet the actors who performed with her. She practices playing with San Xiao. When she was tired, Tang Youyou went to rest, but she mistakenly sat in Gray's seat and drank his water. San Xiao quickly reminded Tang Youyou.

Suddenly, Gray came, and Tang Youyou sat there stunned, but Gray came out like a child. Tang Youyou joked with Gray, but he was sent by Gray to teach him a lesson. Finally, he was punished by Gray and put into Zongren Palace. The next day, Tang Youyou took Guangu to the set. Unexpectedly, Gray turned her role into a eunuch, while eunuch San Xiao became a bodyguard with a knife.