I'm Already Level 9999, and You're the Only One Who Comes to the System

Su Yang traveled to a different world where games invaded reality. There are dangers everywhere here, there are horrifying ruins where people almost died, there is an unknown wild world, and there are indescribable places that make people crazy. The criss-crossing torrent of world planes has drawn countless players into it, thinking about life and death. In order to become the top strong man, conspiracy, assassination, betrayal, no matter how hard it is! For twenty years, Su Yang went through untold hardships and finally reached the top of the world and became the strongest man. Suddenly the system came and said it could help him start the strongest counterattack from level 1! "You were humiliated because your host was weak. Defeat Zhang Dong (Level 2) who humiliated you!" Su Yang looked at his 9999 four-dimensional panel and the first mission released by the system. "The delay in your system is quite serious!"