In "Walking on Thin Ice", grandpa 14 scolded Ruoxi for being with a prostitute like Lu Wu, which is what Ruoxi said to brother 14 about prostitutes. Which episode is it?

Episode 6: From the Lantern Festival to the Lantern Festival, Ruoxi and Qiaohui went to the streets to see the lanterns, and happened to meet Thirteen and Green Five. Several people made an appointment to go to a nice restaurant to eat and drink, and met the fourteenth son. 14. Seeing Ruoxi with Lu Wu, an elegant prostitute, she felt beneath her dignity and hurried back to May. Mei told Ruoxi the story with Lan Ruo before, which made her wonder whether he liked himself or regarded her as her sister's body body double.