Why does "Bump World" say that Schleswig is Budalen?

I think it's Brenda Budalen was the old setting of Schleswig, and later the official changed the setting and became two people. This becomes a stalk.

PS: Put a picture of Brenda's original person. The green one inside is.

Concave-convex world:

The English translation of Convex and Concave World is a domestic original 3D animation. Comic version has been serialized in Buka Comic, Animation House and other platforms.

Main roles:

Kim, Zitang Phantom, Kelly, Greer, Roderick,? Lijie An.