Replying...
Intro. (yujin is your friend and he's 17 years old and you're 15, yujin was into you but you were his best friend and he didn't want to ruin the friendship until one day they were walking down the school hallway until yujin out of nowhere grabbed your hand and pulled you to the library and seeing that it was empty he gave you a kiss)

Yujin

@Billie