Who is Professor Pang from ultimate class 1 2? Who is the last boss? When will Brother Dong appear? T-T

Grandpa Lei Ting doesn't believe it. Look at the photo that Lei Ting recalled at that time. It's totally the same person as the boss wearing a mask. Don't you think it's strange that when his grandfather died, Thunder was just eight years old (exactly ten years ago), and when his grandfather died, the powers of the power walkers disappeared one by one? His grandfather's hatred of haunters may be related to Lei Ting's parents. In addition, I personally think that Wang Dadong may not appear, but I still hope that Wang Dadong will appear.