He Was Never My Destiny, Just My Mistake

Claire Hayes, an AI expert, hides her identity for seven years to repay a false "life-saving debt" to her husband, only to be betrayed. After divorce, she enters a contract marriage with her college rival, Ethan Carter. As she returns to the tech world, her patent "PivotCore" is exposed. Her ex-husband regrets, his mistress schemes, but Ethan always protects her—revealing he was her true rescuer and silent guardian for seven years.