Disciple of the Three Kings

I became a disciple of the strongest! Chaos began to invade the world. One day, a gate suddenly appeared in the world, and monsters poured out. Humanity stood on the brink of destruction. The world of martial arts, "Eun," the world of magic and knights, "Einheart," and the world of the demons, "Gehenna," were connected, and superhumans swept away the monsters. However, they were not righteous saviors. They persecuted the newly created "players" of Earth under the law of the strong. Lee Ro-Woon sought to bring peace to the world by coordinating the players with superhumans from other worlds. Due to the betrayal of his colleagues and the superhumans from other worlds who disliked his actions, Lee Ro-Woon lost everything, becoming a wreck and falling into the abyss. Just when he was about to give up, he was transported to a sealed world as a vessel of chaos, where he encountered three absolute powers. Lee Ro-Woon became the disciple of the Three Kings and reigned supreme over all! (Source: Kakaopage, translated)