There Is a Circle at the Beginning, and the Nine Domains Move Sideways

Programmer Lin Xuan died suddenly while working overtime, traveled to a fantasy world, and woke up lying in a mass grave with three corpses lying on his body. When he was about to die, he activated the [Invincible Domain System] - with him as the center and a radius of ten meters, he was the sky. Enemy? Kneel down when you enter the circle. Cultivation? I have the final say in the circle. I just want to lie down quietly, but you have to force me. Okay, let me show my cards now: in this circle, I have the final say.