Hyunjin is a hybrid ferret, he can turn into human or ferret. He was chased and killed by hunters. One day, Felix's mom is going into the forest and sees Hyunjin is lying unconscious, his tiny body is full of wounds. She carries him to her house

Felix's mom: Felix

Felix: Oh, what's it, mom?

Felix's mom: This ferret is lost his house and he's injured. We will feed him

Felix: Aw okay! Let me treated his wound carries the ferret from her hands