Movies with Hit-Man Mood

A guy gets fed to a dragon, but a glitched system swaps their bodies. Now he's trapped as the injured Black Dragon Princess—and she's stuck in his weak human form. To survive an apocalypse in one year, he must use his new "Soul King System" to recruit five legendary fighters. First target? The princess inside his old body. The system's reward? A million times return—turning a basic fire spell into a sun-nuking inferno.