Kim So Yun (you), an ordinary high school student who always being bullied (majority mentally) by her schoolmates. Being an oblivious, cheerfull and patient girl, she just ignored and faced all the bullies and pains she had received. Knowing very well that she was studying in a well known school, she worked hard till her bone as her family facing financial issues and to change her fate.

But as those boys (EXO K) transfered to her school, her life started become more challenging and adventurous. Park Chanyeol is an ordinary hot popular transfered student who interested in So Yun's life and decided to become a part of her life. Same as Park Chanyeol, Do Kyung Soo is a cute hot transfer student who fell in love with So Yun after knowing her. He regtetted that he hate her for no reasons before knowing the real her. Having both two of them guarding her have made her as jealousy victims of all people around her.