Park Hwayoung or "Hwan" is a junior in high school. She is very talented and beautiful and amazing in any kind of fighting but not popular. In fact she gets bullied a lot. Her only friend in highschool is min ah. She is a new student at the school. She then meet 12 cold hearted boys who goes to her school as well. One day after school She then gets a job at SM entertainment. She became a personal bodyguard for EXO! She has to protect them from any danger. When she signs the contract it says she can't fall in love. But when they become closer what happens when all of them starts to develop feelings for her. She also finds some secrets about her friend MinAh. How will things go when she starts to become bodyguards for EXO