There’s more to this world than meets the eye of ordinary people; beneath the surface lies an underground realm most will never encounter. In the shadows, government agents quietly handle threats, while assassins hired by financial magnates discreetly solve problems. Assassins, mercenaries, arms dealers, and secret agents—all are connected through a dark web that binds this world together, with wealthy elites attempting to control everything with money. Gao Yi fought his way into this underground world, carving out his own domain with unmatched close-combat skills. But in this realm, guns reign supreme. Beyond seven steps, speed determines victory. Within seven steps, it’s about both speed and precision. Only within three steps do Gao Yi’s fists dominate. They say, “If you can’t beat them, join them.” But Gao Yi wanted more. He wanted it all—to become the king of assassins among mercenaries, the top agent in the eyes of assassins, the foremost assassin in the eyes of agents, and the unrivaled intelligence master among arms dealers. His ultimate goal was to ascend to the throne of the entire underground world. Gao Yi would become the Ultimate Firepower.