Jongdae, together with 11 other boys, are members of Hanyang High School's baseball team, EXO. Good-looking and popular, they attracted the attention of many girls in school.

Despite being aware of all the attention they get from the girls in school, they choose to stay single. However, little did they know that EXO has a plan, which was to confuse the minds of all of these girls who are going crazy over them through the things they do. 

One day, Jongdae was challenged by s to write a love letter to a girl thrice his size. Will he do it?
And who is this girl? Is she going to fall for it?