Hyukjae and Sungmin is a best friend since they in kindergarten while Donghae and Kyuhyun is a bestfriend since their highschool. Lee Hyukjae and Lee Sungmin studied in same high school even stay in same class. Same goes to Lee Donghae and Cho Kyuhyun. 4 of them become close when they meet at Community Library to study for their school end exam. What will happen when they fall in love with each other?