What does the animation "Drama in Drama" mean?

The scenes in the play, as the name implies, are also animated with content. The most famous one should be the unfair lottery of Xian Shiyan, which appeared as a famous animation of Xian Shiyan and caused extensive discussion in the animation. Then the unfair lottery ticket was separated from the fairy rock and made into an independent animation. In fact, there is another animated drama that many people know is the super action hero in Crayon Shinchan.