The Weakest Upgrade System in History

"System, didn't you say that if you wait for my golden elixir, you can stabilize the normal Qi training stage? Look, I'm about to be hacked to death by this Qi training junior!" Sassoon said angrily. The system said tentatively: "I wonder if the host knows that there is a saying called over-level killing?" "I crossed your grandma's legs, and the garbage system misunderstood me!" The system claims to be the fastest upgrading system in all worlds. Sassoon thought he was prosperous, but unexpectedly he was trapped deeper and deeper.