Kang Minyoung, a sweet girl who was very quiet and very smart in school. She is 17 years old and she was living with her dad and brother, Minhyuk. Probably wondering where her mom is but she died in a car accident when Minyoung was 3 years old. Minyoung always focuses on school first so she can get into a very good college. She wanted to achieve her dream by being a famous writer. She never has anything getting in her way. When she needs help, the only person who will help her is her brother, Minhyuk. 

Kim Minseok, also known as Xiumin who is a part of a cool boy group in school called EXO-M. Girls love the group for their personalities and looks but they can be really mean but for Xiumin, he was the very kind member in the group. He doesn't like messing with other people like his 5 best friends does.

One day, that's when Xiumin approaches Minyoung but he was dared by his best friends. They also dared him to ask her out and Xiumin refuses. Xiumin wants to at least chat with Minyoung but he never had the guts to until he was dared by his best friends.

Then Xiumin approached Minyoung and asks her out. During their relationship, Minyoung finds out about Xiumin's game that he made with his 5 best friends. All of this was a total lie. She felt used. Minyoung didn't want to go to school after what just happened.

Xiumin decided to go to Minyoung and explain everything that hapened between him and EXO-M. Minyoung starts to believe him and that's when Xiumin pops these four words that will change her life forever.