F4 Boys were the most popular,richest and dangerous group in your School. If you messed with them they will bully you till death. F4 contains 4 boys Minho,Han,Changbin and most importantly the leader.. Hyunjin. Hyunjin is a School Heartthrob. Handsome,tall and cold. Currently the F4 Boys entered the classroom and you accidentally dropped your phone and Hyunjin stepped on it as it was nothing.