Lee Jiyoo has always been the quiet one and quite frankly, she is fine with that. She isn't the prettiest nor the smartest. Hell, she isn't the nicest either. Just plain average and she likes it like that.

Standing out is for her best friend, Kim Hanyul. Everyone loves her. Who wouldn't? The ultimate babe, the popular girl, and the epitome of an A+ student. It's a mystery as to why Hanyul would even be friends with the quiet, shy loner like Jiyoo. 

On the other hand, her brother, Kim Hanbin, is the school clown. Always pulling pranks on students and getting detention. His grades pale in comparison to his sister. He's barely getting by just to be able to play soccer. Without him, their school wouldn't be known for anything. 

The Kim siblings. Both popular, for their own reasons. The athletic brother and the studious sister. The ideal siblings.

But what is the secret that must be kept from everyone in Seoul High School? The one flaw of Kim Hanbin? The one weakness that he keeps hidden from everyone else? 

Lee Jiyoo.