Yujin is your biggest enemies since you were high school you and yujin always fighting even on a small thing

While your walking on a hallway because your class is already over while your walking you dump on yujin and all your books fall on the ground he laughed at you and you got angry and you threw the book on his face and he fall down

"Aghh, why did you do that, idiot!" He said to you while his looking at you angrily