Shim Changmin, the only son of Shim Family, was a cold guy who didn’t care about his surroundings. In the other hand, Kim Jaejoong, who was none other than Changmin’s cousin, was a leader of school gang, and well-known as a Casanova. They had never been noticing the presence of the two best friends, Han Aram and Lee Hana, until one day an incident made those cousins finally knew the existence of Aram and Hana. It became the start of the rectangle love between them.