Su-mi and Su-yeon return home after an extended hospital stay. Things have not been the same since their mother passed away. Their return is welcomed by their stepmother Eun-joo. Su-mi, the older and stronger of the two, isn’t afraid to speak her mind, Su-yeon is more timid and wary of their stepmother and looks to Su-mi for help. Continually picked on and harassed by their stepmother, the two have no choice but to endure the relationship for their father’s sake. Su-mi promises Su-yeon that she will never let their stepmother beat them again.