Jae-hee, the heiress of Cheonil Group and the legendary hacker 'Dr. T', has hidden her identity for love, dedicating three years as the secretary to Ji-han, the CEO of LM Group. However, on the night she intended to confess her pregnancy, she was met with the news of Ji-han's engagement to the fake 'Dr. T'. To make matters worse, Jae-hee is kidnapped by the 'fake Dr. T' and faces the risk of losing her child, but Ji-han coldly stands by and even frames Jae-hee as the kidnapper. Ultimately, she decides to disappear with her child... Ji-han's obsession begins belatedly! Can Jae-hee protect her child and escape from him?