Why Did Pangu Open the Sky?

"The opportunity has arrived, the choice is yours." Option 1: Live and die with the prehistoric people, and you can get a Nine-Dragon Coffin. Option 2: Sacrifice the system and let you survive alone. Option 3: You still have to sacrifice the system to get it, so that you, Nuwa, Xihe, and Chang Xi can survive together. When everything dies, there is nothing I can do. When nothingness comes, I am one of nothingness. I have perished in loneliness, and I will return when all things are perished! After all, it was Pangu who opened the sky, and Hongjun preached the Tao. What are the changes and the unchanged?