Which episode is about the solemnity of Lan not going to the hotel?

The fifth episode. Wei Lan didn't celebrate her birthday in the fifth episode of the TV series "The Top of Yi Yunyun". She went to the hotel where the birthday party had been arranged in earnest, hoping to give her a surprise. "Top of the Escape Cloud" tells the story of the protagonist's solemn and tortuous process, and finally catches up with Lan Weiwei's love story.