Lucy Grant never believed fiction could bleed into reality. As a cardiothoracic surgery resident, she lives to save lives, not to become a story. But when her famous webtoon artist father mysteriously disappears, Lucy is pulled through his computer screen and wakes up inside the world of his bestselling series, X. There, on a rain-soaked rooftop, she saves a dying man: Alexander Blackwood, the webtoon's billionaire antihero, a man driven by revenge, a man never meant to be real. Lucy soon discovers a terrifying truth: She can only enter or leave the webtoon when Alexander's emotions spiral out of control. The closer he grows to her, the harder it becomes to escape. And the more she falls for him, the more the story itself begins to change. As secrets unravel, Lucy learns that the villain hunting Alexander wears her father's face. To end the story, Alexander must die. To save him, Lucy must choose between her family, her world, and the man she was never supposed to love. Lucy faces a profound choice and makes sacrifices to break even the strongest bonds. Will Lucy walk away from the story... Or become part of it forever?