The System Brought Me Back to Life, and Something Was Wrong with Them All

Facing systemic doubts Wang Bai hehehe, "I will go back to my alma mater after the first semester of my freshman year to show you my kindness and righteousness. Otherwise, you can teleport me there and I will walk back to Qingbei, or you can just strike me to death with a lightning strike." "If you have the ability, you can kill me! I told you to go back to your alma mater and see what it looks like?" I have already traveled from 2025 to 2019. How can I walk back?