Yellow bark for sealing the mother stem of animal ear

Hello, I would like to ask what is Huangpi's ear stalk? It was Muchuan who turned Huang Bei into a beast-eared mother. In "Sister Beauty", I cheated her body and took her back to the morgue! In chapter 20, the weasel asked a student for a seal, saw Muchuan and asked Muchuan, "Young man, do you think I look like a man or a fairy?" Kimkawa said, "Well, I think you look like a blond beast. Let me see if you have come out. " So, it was Muchuan who turned Huang Bei into a beast-eared mother.