What does this joke mean? What Lu Xun and Yan?

Yan, whose real name is Badger, is a wild animal that likes to eat melons. The word Yan was created by Lu Xun in Hometown.

Yan, and Xun all appeared in Hometown. The original text is a dialogue between moistening the soil and seeking songs. The last sentence here, "No, I'm Yan", is purely a joke.