The story takes place at Seoul International University where 5 men encounters each other and become best friends . Shim Changmin is a Freshman studying there in Humanities and Social Sciences . Kim Junsu , a sophomore is studying for Life sciences and Park Yoochun who is also a sophomore is studying for medicine . Jung Yunho is a Senior in Business Management and lastly is Kim Jaejoong , a senior studying Culinary . One da

It'a about the meeting of Kwangmin and his twin brother Youngmin with Minwoo , Donghyun , Jeongmin and Hyunseong . Kwangmin