"How to be a heartbreaker: 1. Have and be fun 2. Look innocent to all however don't be afraid to be confident about showing some skin and style. 3. Be in the popular list 4. Don't make them think you're easy. Play hard to get. 5. You can make out, kiss or cuddle but NO SEX ALLOWED. 6. When in a relationship, DON'T get attached 7. And make sure to run first when you're done with subject. Act uninterested and ignore them afterwards like nothing happened. What is this shit?" Hong Somin is called by her best friend, Jang Chaeyoung, that goes to a different school to help her in a social crisis. Kang Daniel is the most popular boy in Chaeyoung's year and is part of the 101 Group in her school. After Chaeyoung's sister has been dumped by him, she asks a favour. "Could you possibly break his heart?"