Junhui is your friend since childhood, he is younger than you, even though he is younger than you, he is very cold with the people around him and with you even though he is cold with you, he just accepts your hyper attitude. Because you and junhui have known each other since childhood, and your parents and his are very close and you two are close too, now you and junhui are in high school. So today's class is over, he goes to your class and knocks on the mirror outside your class.