name: song minho                           

birth date: 1993.03.30                                                    

blood type: A                                                                         

trait(s): ambitious, passionate, smart. can be very gentle.                            

well known for being song hwangi's son, practically the only inheritor of his business company. has a little sister named song danah who is rebellious and walked out from the family mansion and strict rules.

name: irene bae / bae joohyun

birth date: 1991.03.29

blood type: A

trait(s): shy, but not anymore. perfectionist. hot and cold.

fashion editor, intimidating yet charismatic. she's neither filthy rich nor has a wealthy family background, but she has stable job. accused for using her attractive face to manipulate rivals.

name: park chorong

birth date: 1991.03.03

blood type: O

trait(s): very friendly, tends to be babysit those who is important for her. can whip someone's if she wants to.

irene's best friend slash second mom. also irene's colleague. slightly hates man because painful past, because of that past she easily judge chaebols or chaebol's son.

from left to right;

name: lee jinki, kim junmyeon, jackson wang, lee seunghoon

birth date: 1989.12.14, 1991.05.22, 1994.03.28, 1992.01.11

blood type: O, AB, O, A

trait(s):

lee jinki → mature, composed and calm. he let his life flow with fate; he's not  being too hard on himself.  

kim junmyeon → serious, when in heated situation/arguments he's able to think with his brain. very rigid, he always obey rules.

jackson wang → jokester of the group. very laid back; friendly. girls are confused with their relationship with jackson since he get along with everyone.

lee seunghoon → lighten up moods easily. flamboyant. ladies man. loves children.

these guys are mino's inner circle. they've known each other for a very long time, maybe since childhood. they all come from the same background,  wealthy and influential family, but they deal with different problems.