It's about how this girl, Autumn Zaches, coming from overseas, transfers to Killara High School and there she meet's a year 11 guy who was told to show her around because she's new. His name is  Kim Hyunjoong aka, Justin. He's been told to look after her for a term at the most. During that time, he's her big brother and soon they develop an intimate relationship. As they begin to fall or each other, things change. They discover secrets about each other and their past catches up to them.