Brilliant surgeon Seraphina, poisoned by a rival and desperate for a specific cure, enters a contract marriage with the cold billionaire Ethan to appease his grandfather's dying wish. For four years, she plays the role of a forgettable, submissive housewife while secretly restoring her health. The day her health is fully regained and the grandfather passes, she demands a divorce. Only then does Ethan discover the truth: the 'ordinary' woman he discarded is a global medical superstar with connections more powerful than his own empire. As she vanishes into her real life, Ethan begins a desperate hunt to win back his only cure.