Hey my name is jiyeon you may be asking how i became cold i will tell you 

2 years ago 

Flash back 

I was in love with my childhood friend baekhyun he was samrt and handsome

finally baekhyun asks me out with him on a date of course i said yes 

I weared a white dress above my knees and a silver heals and make my hair straight and put a little make up .... ding dong the door ring i ran to it and open :) 

Baekhyun : omo omo jiyeon is that you ! Omo you are very pretty now?! While smiling

Jiyeon : yaaa baekhyun do you mean that i wasn't pretty 

Beakhyun : my sweetheart is pretty all the time 

Jiyeon : ya you embarssing me 

baekhyun : omo your face become red hhhh , i will call you tomato

Jiyeon : okay bacon hhhhh

baekhyun : yaaa stop this or i will force you 

jiyeon : make me ... bacon bacon bacon bac..

beakhyun grab jyeon hand and kissed her

baekhyun : hhhhh i told you while he was laughing xD

jiyeon : yaa come her i won't let you  and ran after him people were whatching them 

Girl : look at them they are so cute why are you not like him 

boy : yaaaa you are so annoying it is enough that i love you

jiyeon stopped she was tired he came closer to her ad hugged her i love you my princess ..... they have been dating a mothe ago

Jiyeon pov's

I got a phone call 

jiyeon : really when is she coming ?

person : **** 

jiyeon : tomorrow okay 

my cousine or should i call her my sister transfer to our school she was very pretty all the boys want her but she never mind 

Jiyeon pov's

It is have been a week since yoona came every thing change baekhyun have changed alot he becam cold to me and crul what made him like this 

one day my phone rang 

jiyeon : yeposeyeo

** : come to ****554**** now baekhyun needs your help ... call ended

Jiyeon : wae ? Yeposeyeo ! Aissh

Jiyeon pov' when i hear baekhyun name i was scared is he in danger i must go to help him

I ran fast to that place i was afraid it was scary the street was dark  there were drunk people looking at me i walk fast 

i stopped suddenly and my tears come's out i saw baekhyun kissing yoona    i went closer baekhyun noticed me 

Baekhyun : jiyeon i i am s...

i slaped baekhyun hard 

jjyeon : why baekhyun you do that why ?!! 

baekhyun :  jiyeon i  love yoona 

jiyoen : yoona ?!!

jiyeon : you yoona i treated you as my sister why ?!! While she was crying

yoona : jiyeon i love him please forgive me 

yoona pov's 

jiyeon i am so happy you don't know that i hate you   ....end pov .

Yoona hugged jiyeon and say in her ears 

yoona : hhhhh jiyeon you little bastard i hate you you didn't noticed that how stupid you are it didn't take a second to make baekhyun fell in love for me i will never let him so leave us alone and go away and never come back

jiyeon was shocked from yoona she thought that she is her sister but she was wrong

Jiyeon : i will never forgive you both never 

and i ran away never look back and never see them again

That day jiyeon sweared she will never forget what they have done to her and she will come back and take her revenge 

jiyeon pov's 

just wait and see yoona what i am going to do 

End flash back