Exo-K, the most popular idol group in Korea. "M", the most feared school gang in Korea. Members from both group battle to win the heart of a girl, Li Sno. She devoted her life to studies but her life is about to take a big turn when her best friend is engaged to Park Chanyeol from Exo-K. Sno was set up to date Byun Baekhyun who is also from Exo-K but slowly she realized that her heart is somewhere else, somewhere in the hands of Park Chanyeol. Not only that, gang leader from M, also has devlope feelings for Sno. Friendships will be torn apart and hearts will be shattered. What will she do?