House Vance’s second daughter Aelia is killed and reborn, returning to mate-selection day three years earlier. To escape her past-life doom, she swears by her soul and chooses Ethan—the serpent clan’s outcast locked in an iron cage—and is disowned by her father. With peerless apothecary skills, she dismantles the schemes of her sister Selena and Lion King Damon step by step, while Ethan is revealed to be the Black Dragon Emperor who has lived ten thousand lonely years since his mother sealed the Reckoner with her soul. Bound by a soul pact, sharing life and death, they grow from wary partners to devoted allies, crippling the Reckoner through soul resonance and shattering the conspiracies of House Vance and the Church. Aelia rises from abandoned daughter to Dragon Queen, standing beside Ethan.