Jung Hye Rim - very naughty, cheerful and carefree. Jung Eun Hye - the fraternal twin sister of Hye Rim, angelic, kind and happy-go-lucky. One day, Hye Rim and Eun Hye got kicked out of high school for breaking the window of her teacher's car. Being the daughter of the owner of the most famous company in the country, she easily got into another school together with Eun Hye. In the new school, a class consisting of 31 students called "The Rebellions", they met 12 other guys with different personalities - charming, quirky, handsome, and also cold. What happens when the very naughty girl meets a very playful boy? What happens when the very kind girl meets a very charming boy?