Myungsoo: 

His biological mother put him up for adoption when he was born and he was adopted into a childless family. His new parents raised and cared for him, until the day that another car hit theres and Myungsoo's custody was given back to his Biological Grandparents who fought in court for him. He is now moved to a grand old manner by the sea, where he learns more of his past and has to deal with the loss of his parents. He isn't short on money, and has a bright future, but first he knows he must start life again. He can't keep living in the past. His young heart is open for the taking, but the one who is to claim it must be able to still climb over the walls that he has built around it. 

Sungyeol:

Sungjong is very confident and knows what he wants and when he wants it. He has always had his eye on Woohyun, until Myungsoo comes along. Sunggyu takes this opertunity to try to get ride of Sungjong once and for all, and give Sungjong someone else to flirt with. Sungjong is flirty, but knows how to act cute and use this as a way to seem like he was just wanting to be friends, but Sunggyu can see right through his act that his own boyfriend, Woohyun can't. The problem is, Sungjong is too damn y and he knows it...

 

SungGyu:

Sunggyu is quite down to earth and is extremely protective over his boyfriend Woohyun. He is always trying to keep Sungjong away and trying to keep a hold on Woohyun's attentions. Sunggyu is close friends with Sungyeol, and is not part of the popular crowd but still manages to date one of the people from that group. He is kind, but has a plan of his own, one that does not care about Myungsoo or anyone's happiness but his own.

Woohyun:

Woohyun is funny, athletic and handsome. His best friend is Dongwoo. He is dating Sunggyu and thinks that Sungjong is just cute. He never understand why Sunggyu and Sungjong hate each other so much, because sometimes they seem like friends, the next minuet they can be shooting daggers at each other. Woohyun is a sweet and respectful boyfriend, but he can be a little bit simple minded at times.

Dongwoo: 

Dongwoo is Woohyun and Sungjong's best friend. He always has his friends back and likes to joke around. He is also heavily into sports, and is quite smart and the teachers love him. He can be the life of the party and a great friend if you are on his good side, however if you are on his bad side, he can be your worst nightmare.