Meet Park Minhee, an average 17 year old highschool girl who is well-known for being a nerd and a wallflower. She is among the few girls who hadn't had their first kiss. The funny thing is, being a wallflower, Minhee has never been ignored or shunned by her friends. This is thanks to her best friend who is the exact opposite of her. 

At Seoul High School you'd ought to be a total weirdo if the name Kim Jongin, a.k.a 'Kai', doesn't ring a bell. He is famous for being the 'playa' of the school. Almost 80% of the female population have been in a relationship with him, either freshmen or seniors, you name it. Whenever Kai is there, girls, even female teachers, can't help but swoon at his presence. Who wouldn't? A handsome face with y lips waiting to be kissed, charming dark brown eyes, and a well-built body, not to mention the y six pack and abs, any girl would kill to have that man.

He is also the best friend of our little Minhee. What Kai doesn't know is that his childhood friend has been keeping a secret from him, in fact, too big of a secret.