Could this guy really be my brother?

The summer before her senior year of high school, Woo Chae Won is sent to Seoul to attend summer school at her brother's college. Not only this, but she will be living in his apartment for the entirety of the summer. Sounds like a total drag, right? So why does the very thought make Chae Won's heart race?

What, do you have some kind of  oppa complex? Aish...

A lot can happen over the course of one summer...