Cardiothoracic surgeon Oh Yeon-joo's (Han Hyo-joo) father mysteriously went missing while writing the last chapter of his webtoon "W". Yeon-joo goes to his office and is shocked to see a scene of a bloodied Kang Cheol (Lee Jong-suk), the main character of W, on her father's monitor. While reading something left behind by her father, a hand from the monitor pulled her in. She found herself on the rooftop of a building, next to man lying down in blood. She manages to save him but is shocked to realise that the person she saved was Kang Cheol. Before she knew it, she was back in her father's office. *All rights belongs to MBC & Dramabeans