Kyuhyun woke up with a terrible headache lying beside him was his best friend, Tiffany... "Oh thank God we didn't do anything stupid last night!" Suddenly, some kind of blinding light hit his eyes.

Tiffany grew up in a neighborhood with boys. Together with Heechul, Eunhyuk and Kyuhyun, they have made their own circle of friendship. What happens when one day, a new girl arrives in their neighborhood? How will this affect their friendship? What happens to Tiffany when there's a new girl in her friends' lives?