Four years ago, the day after proposing, Declan Fulton lied that he needed to take responsibility for another woman, and cruelly broke up with Nina Sterling, leaving her completely devastated. Heartbroken, Nina vanished without a trace. When they reunite, Nina has grown into a capable emergency physician, treating Declan only with cold indifference. Declan, a senior first officer, is overwhelmed with obsession after their reunion. As past misunderstandings are gradually uncovered, he is flooded with overwhelming regret when he learns the full truth. The always restrained, composed first officer loses all control, sets aside all his pride, and desperately fights to win back the beloved he pushed away with his own hands.