Sungmin has been home-schooled all his life, and he's tired of it. After the death of his parents, he's been under the care of his grandma, who's afraid to lose him as well. Hence, having him home schooled. Fortunately, he pursues his grandma to have him enrolled into a normal (that's what he thought) high school for his senior year.

Kyuhyun has been seeing the same faces all his life, and he's tired of it. Being the son of the school principal he had been studying in the same school, with the same classmates, and the same teachers that bored him to death. But on his senior year, he won't seem to be bored, because a new student was going to be in his class.