Eunjung’s mother married to Hyomin’s father, that made Eunjung and Hyomin step-sisters. As the only child and spoiled rich kid Hyomin was, she wasn’t happy to have a step-mom and older step-sister, she disliked them and tried to bully Eunjung, but Eunjung never fought back.

As time went by, Hyomin started to accept Eunjung and her mother. Eunjung’s mother has fulfilled Hyomin with a motherly love that she never received and Eunjung always took good care of her, they became a happy family but that didn’t last long. On a business trip, their parents had a severe car accident and they passed away in hospital. Eunjung and Hyomin leaned on each other to go through the most difficult time in their lives. As they're growing up, Hyomin realizes that has fallen in love with her step-sister, but it seems that Eunjung always keeps a distance between them, Hyomin tries to give up on her step-sister by playing around but she ends up hurting herself even more.