In both stories, the main character's heart is mercilessly torn out in a brutal act meant to control them. Though they remain alive, they are stripped of the ability to feel or understand emotions. This sets the stage for a powerful tale of love, regret, revenge, and betrayal, where the absence of a heart drives them down a path of conflicted emotions and haunting choices, leaving them to grapple with their humanity and the consequences of a heartless existence.
Oh Sung Moo, the father of cardiothoracic surgeon Oh Yeon Joo, mysteriously goes missing while writing the last chapter of his webtoon "W". Yeon Joo goes to his office looking, but a hand from his monitor suddenly pulls her in, and she finds herself on the rooftop of a building, next to a bloodied man. She manages to save the person, only to realize that he is Kang Cheol, the main character of her father's webtoon. Yeon Joo later discovers she can only enter and leave the webtoon depending on Kang Cheol's feelings.
