This is not a "cheating makes you invincible" story. The system will reset and the host will fail - before Li An, the Gun God system had been activated twenty times, and only one person reached the end. Li An is the twenty-first. He asked Zero: "What if I reset you?" Zero's answer was only one word! Laugh. And hidden in that laughter is the courage to still choose to believe after being disappointed twenty times.
When the lights of the Major hit Li An's face, when the barrage pool was filled with "Le0", when he could finally say "Hello everyone, I am G2·Le0" everything had just begun.
The gun god is not a god. The Gunslinger is the one who shoots the next bullet when everyone else has given up.