Jungkook, a playboy who dates girl just to dump her one or two weeks after dating them. Boy is just a one night thing for him. But one day when his friends had challenged him to date a boy for month, he can't back up because the reward for that challenge is what he yearned for. So when his friend find him a boy just by pointing his finger to a random boy and it happened to be a nerd one, and to make it worst, the boy is mute, according to his other friend.   

Jin is having trouble in one of his classes so his teacer forces him to get tutoring, but when his tutor happens to be his seceret crush will he ever learn biology.