Main characters:

Lee Sungjong                                                            Lee Sungyeol               
                   

innocent guy with lot of charms                             hectic guy with too much enegry

good behaviour (a little girlish)                              skips his classes regulary

always (?) nice to other people                             one of the least best in school

one of the best in school                                        cherishes his friends the most

forgives easily                   

Following characters:

Kim Myungsoo (L)                             Kim Sunggyu                                                  Nam Woohyun

Sungjongs best freind                      the oldest of Sungyeols' friends                  lacking at sports

always at the library                           not easy to please                                         girls fall for his charms and looks

closed guy and not talkative             Umma for all problems (secretly)              likes to hit Sunggyu

Jang Dongwoo                                        Lee Howon (Hoya)

lovely guy with an unique laugh            charismatic guy

lazy but good in school                           looks like a bullying type but he isn't

seems to be never sad or angry           has a addiction to cute/fluffy things (secretly)

Story

Sungyeol doesn't like learning, he really hates it.

Sungjong loves learning and beeing good in school.

You'll see what's following next ~~

Upcoming Pairings:

Yeoljong for sure

Yadong and Sunghyun ... maybe ? Who knows xD