BROTHER COMPLEX

We were all kids of the same household although big brother (eunwoo) isn't .But mom and dad treat all five of us equally .And apart from that dad is really fond of big brother as well.
The story began went I started realizing that I actually liked my own brother(not blood related)!

Eunwoo:Y/n ,do I look good with this suit?
Y/n:Yeah ,it's not bad.Why?Are you going somewhere?(rough attitude)
Eunwoo:Um ,kind of.Mom has set a blind date for me today so..
Y/n:(walk out and bang the door as I go out)

Family:
Mr.Cha (father)55 yrs
Mrs.Cha(mother)47 yrs
Miss cha sisu(1st daughter)23 yrs
Miss cha haneul(2nd daughter)21 yrs
Miss chayoung(3rd daughter)20yrs
Cha Eun woo(adopted son)19 yrs
Cha y/n(last daughter):17 yrs