Four best friends are trying to live the legacy of their five excellent seniors who graduated from college with flying colors found themselves in ex-boyfriends-complex situations.  The Kyu-line is known for having the four closest perfect guys around and they have been aware of that since they have established the said group.  And they messed the girls’ friendship as they found each of them falling in love with the wrong girl.

See how they all find themselves falling in and out of love in someone who supposed to be off-limits according to the golden girls’ code:Don’t hook up with your bestfriend’s ex-boyfriend.

The Kyu-line

An all-boy group of friends started by Cho Kyuhyun and Shim Changmin.  The group was named after the young Kyuhyun as much to Changmin's disappointment because it sounded better than Min-line or Chang-line.  They have high standards as to who are the ones to be able to join and recruited Kim Ryeowook(already graduated), Choi Minho and Lee Jonghyun.  These guys have their own fangirls and they are considered as the golden boys. 

Shim Changmin

He's got it all.  The looks, the money, the brain and the girls.  He is the known womanizer and no one seemed to mind, especially girls as long as they could hook up with this guy.  He is serious about his studies as he is one of the top students and he is also serious about playing around as he could just do anything that he wants.  He is the mastermind of the Kyu-line and always stays just behind everyone else, loving his masterpiece.

Current girlfriend: none

Ex-girlfriend: Kwon yuri, Seo Seohyun, Im Yoona, Goo Hara, Lee Yeonhee, Song Victoria and the list goes on.

Cho Kyuhyun

This guy knows what he wants and makes sure to get it.  The founder of Kyu-line and decidedly named it after him as he believes of his greatness.  He was friends with Changmin since they learned to order around everyone.  He is highly skilled in computer gaming and a member of a professional Starcraft gamers' club.  He doesn't believe in love but he thinks relatonships have their own way to work out. 

Current girlfriend: Choi Sooyoung

Ex-girlfriend: none

Choi Minho

A member by association meaning, the Kyu and the Min pretty much bullied  him when they were little to be their friend as Changmin figured they needed a less superior friend than them but still on the same level.  He is completely competitive and a known sportsman wherever he goes.  A star player and a sweet guy that girls chase and cheer for.  He is a very romantic person and vows to do everything for the love of his life.

Current girlfriend: Kwon Yuri

Ex-girlfriend: Jung Krystal

Lee Jonghyun

The artistic one among the group.  He was a highly recruited member since he was the only one who could land a blow and more(four punches and 2 kicks) on Shim Changmin because Changmin called him pretty.  He is said to be in love with a certain girl but only Changmin knew of and never settled for a relationship ever.  He is the lead guitarist of CN BLUE and always chased around by his groupies.  He may be cold at times but his appeal still draws girls towards him and he never runs out of flings.

Current girlfriend: none

Ex-girlfriend: none

Girls' Generation

The nine-girl group of friends since their preparatory school.  Five members, namely Kim Taeyeon, Jung Jessica, Lee Sunny, Hwang Tiffany and Kim Hyoyeon, have already graduated fron college and now living comfortably with their jobs.  The four remaining girls are now considered as queens of the school and they pretty much get what they want.  

Kwon Yuri

She is the president of the student government and is a very politically ambitious person.  People consider her as the playgirl for she has a colorful history of ex-boyfriends.  She is also known to have a seemingly dual-personality for she is known to be nice and playful at times but determined and serious when needed which is most of her time.  She is also the unnies' pet as the already graduated members of SNSD dote on her.  

Curent boyfriend: Choi Minho

Ex-boyfriend: Shim Changmin, Kim Jaejoong and Jung Yunho

Im Yoona

She is also known as the golden girl.  She is everyone's dream girl and epitomes the perfect girl.  Her angelic face and bright smile lets her get what she wants.  She is the campus muse by default and the front cheerleader.  She seems to be frail but she has proven herself to be strong and independent over the years.  She is capable of turning half of the biys from their university down without them feeling bitter towards her.  

Current boyfriend: none

Ex-boyfriend: Lee Donghae, Shim Changmin

Seo Seohyun

If there is anyone who could beat Yuri in public speaking, it is Seohyun.  The cultured daughter of their all-girl high school principal.  She is oftenly passed as an uptight woman.  She could shut you up with her righteous rules and what's not in the world.  A very diligent and studious student and was always on the top three student ever since she started schooling.  She once fell in love but considers it now as a part of growing up and she could write a book of what she learned by dating Shim Changmin.

Current boyfriend: none

Ex-boyfriend: Shim Changmin

Choi Sooyoung

She was priveleged to be born in a very rich family and it gave her an almost automatic friendship with the likes of Lee Jonghyun and Shim Changmin.  But it was the Cho family that her family is most close to and thus she has been dating Cho Kyuhyun when she entered Junior High.  She believes in ever after and she thinks that her forced relationship with Kyuhyun is the most romantic thing on Earth.  She is a very opinionated woman and is the most emotional member of their group.  

Current boyfriend: Cho Kyuhyun

Ex-boyfriend: none