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When Chaerin Eun becomes the protagonist of the romance novel she is reading, she expects a fairytale ending with the novel’s love interest, Jeha. But when a bizarre twist makes her realize the story is not playing out as it does in the book, she’ll need the help of an unlikely character from her class to defy the new storyline and find her happy ending -- if only she can figure out who this ‘Unknown Extra’ is first! (Source: WEBTOONS)