As Soon as I Entered Reincarnation, I Picked up a Three-Thousand-Year-Old Ghost

I was summoned by myself from the parallel world to die for her. They say that I am an ancient "guardian" with twelve keys to save the world buried in my soul. Clearing the doomsday level is not for resurrection, but to collect "memories" that I have forgotten. All players want to kill me because if they kill me, the key will be revealed. Only Ji Hui was different. He stood at the other end of the mountain of corpses and the sea of ​​blood, and only I could see him. "Don't be afraid," he whispered in my ear, with the world crumbling behind him. "They are chasing you because in your memory -" "Hides all the clues on how to find me." And I am the only one who can make him "exist"