Why is Huanzhugege 1 and Huanzhugege 2 asymmetrical?

Because the first part is over, singing with a cheerful horse is an ending. The second part is to make the audience curious Why they were beheaded and then turned into their guest house leads to the next story. When they are beheaded, everyone will understand what happened. If Swallow and Wei Zi were beheaded from the first episode, the audience would not see them. And the end of the first movie is so beautiful, and the story is not over yet, so in general, this is flashback!