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Fictional webtoon entitled W is written by its legendary author Oh Seong-moo which begins to function on its own, like a different world existing there. The story-line of the webtoon starts when a handsome and intelligent boy Kang Chul becomes famous as he won a shooting competition. But this fame is interrupted when the unknown Murderer massacres his family, and he is erroneously accused of the crime. Yeon-joo is the daughter of the author of the famous W. She goes to her father's studio to investigate his sudden disappearance. There, she is pulled into W's alternate universe and meets its protagonist Kang Chul with whom she eventually falls in love.
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Episode 1
Oh Sung Moo writes the most popular webtoon series known as "W," disappears on the day before he is supposed to finish the final episode of the webtoon. When Oh Yeon Joo a second-year cardiothoracic resident doctor, goes into her father's drawing room to investigate, an unexplained thing happens. A bloodied hand appears out of a tablet screen and pulls Yeon Joo onto a rooftop where Kang Cheol is bleeding from a stab wound. Yeon Joo ends up saving Kang Cheol's life, only to realize after the incident that Cheol is the main character of her father's webtoon. The next day, Sung Moo just as mysteriously returns and is intent on writing the final episode of the webtoon and once again tries to kill off Kang Cheol. But when Yeon Joo tries to talk her father out of ending the series, she finds herself sucked back into the world of Kang Cheol, his secretary Yon So Hee and bodyguard Seo Do Yoon. Then everything that happens to Yeon Joo in Kang Cheol's world is automatically drawn as the next episode of her father's webtoon. Why is Yeon Joo becoming embroiled in the fictional life of Kang Cheol and who is writing the story?
