Yu Jaeshin, a Crown Prince destined never to rule, reunites with Mo Yeo-hwa, a fallen blacksmith cursed to die when a flower-shaped mark on her chest wilts. Jaeshin takes her in to forge weapons for his war efforts, and they embark on a journey filled with peril and despair. Yeo-hwa struggles with a burning pain she cannot endure alone, and Jaeshin becomes her only solace. As they confront their cursed fates-his entrapment by imperial schemes and her inevitable death-their journey shifts from one of despair toward hope, love, and a fight for life over death.