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Puberty’s tough. But when it makes you shrink to the size of a mouse, or tower above the tallest skyscraper in a split second, it just gets downright traumatic. When Kim Seo-jin is diagnosed with 'Matheson Syndrome', a rare, size-altering disease, his world is turned upside down. So when he meets a strangely alluring boy at school, it seems that his life just gets a whole lot more complicated.