The Beauty Trap: The Demon Empress at Seventeen

She is a princess of a fallen kingdom. She gives him everything, beguiles the ruler for his sake, and becomes the seductive beauty who brings ruin to the state. “Purge the ruler's court and execute the seductress.” When he holds another beauty in his arms, he casts her aside like trash. But when the eunuch presents him with her ashes, he goes mad, slaughtering hundreds of palace attendants as blood stains the palace. His heartbroken roar resounds through the heavens. It turns out she was the only one he ever loved.