Inha and Junhyuk fell in love Inha's sophomore year and Junhyuk's junior year.

Years pass, things change, one of them falls out of love.

Junhyuk begins to cheat, Inha finds out, yet they don't break-up.

Inha is naive and stays with him, thinking he'll eventually come back to her.

But that changes when she goes to college and meets someone who treats her better than he did.

So, thus begins the time of falling for someone else.

But Junhyuk won't have that.