Jessica and Krystal are normal siblings ..they keep on fighting on small things, bickering and 

pissing off each other...

Krystal was the youngest and the smart one..always on top of the class..but she's really bad 

in expressing her feelings...

She has a special feelings for her sister....but she always end up doing it in a wrong way...

While Jessica was just an average in class..a lazy and cold Jessica Jung ...she was at the 

same class as her sister and she really hate it...her life was living in hell in there house and 

now at school also...she really don't get her sister treating her like that..

Her relationship with her sister was like a roller coaster...all of a sudden they were sweet then 

they end up fighting..