Western Crossover: I Bring a Fallen God to the World by Playing the Part

The protagonist, Lin Qi, accidentally transmigrates into a world of American superheroes ruled by a tyrannical Superman and binds himself to a System that makes him stronger by completing “role-playing” tasks. He chooses to play Sunday, spending a month laying the groundwork to convince this world that God exists.

When the heroes from the original world arrive for the decisive battle, he joins the fray as a “third party” and, at the critical moment, uses the power of “Order” to crush Superman on an entirely different level, then “dies in battle” and disappears.

Not long afterward, at an interstellar concert in the original world, a genius singer named Robin bursts onto the scene.