The drama tells realistically of the many various troubles that high school students can face. Ra Eun Ho is just one of them, struggling to survive in a school that discriminates against rich and poor, and believes that the best students are the ones with the best grades. Eun Ho is a cheerful, upbeat girl 18-year-old girl who's dream is be a webtoon artist. When she mistakenly gets caught up in another student's effort to send the school into turmoil, Ra Eun Ho is framed as the legendary Student X, a mysterious troublemaker whose identity is unknown, and suddenly, all of her aspirations are put at risk. Joining her is Hyun Tae Woon, the son of the school's director with a difficult personality and troubled past. In a motorbike accident, he lost his best friend and from there, his life changed. He is uptight, aloof and rude, but as he gets to know the polar opposite Ra Eun Ho, his view on the world changes. He falls in love with her, and together with their fellow students, they decide to stand up against their corrupt school system and make a change.