How to disassemble bear's chubby pen?

The disassembly steps of chubby bear pen are as follows:

1. First, open the green and black parts of Bear's chubby pen cap.

2. After disassembling the black part, I found a small eight-shaped blade.

3. Finally, insert pencil lead and Little Bear Pen into the black cap and turn pencil lead around a few times, then you can open Little Bear Pen.