I Have an Astrolabe That Leads to All Realms

A phone call from an unknown person will change Lu Qinghuan's life from now on. "System, time travel, immortals, monsters, superpowers, experimental subjects..." "Wait a minute, what are these?" Lu Qinghuan slowly put a question mark on his head. "And who are you?" "My name is Lu Qinghuan!" "Hahaha, my name is Lu Qinghuan!" "You are Lu Qinghuan, so who am I?"... "Welcome to the large-scale ethics scene broadcast by Star TV..." "Wait a minute, Nora, you're on stage!"