My name's Ara and I hate girly stuff. I've been raised by my big brother as a boy that's why I became boyish. But then I met him. I hate his guts. I despise him. This guy named Kai. And that's when things started to change... Including myself.

Ji Hyun and Lu Han are childhood friends, who used to spend every day playing with each other and even made a promise to never separate. But what happens when Ji Hyun's parents decide to move from Seoul, South Korea? What will happen if she returns years later? Is the friendship still there or was it eliminated the day she left?