kim minjeong is a daughter of a rich family who could afford anything for her, she's a spoiled kid, much worse is that she can do whatever she wants. in their school, minjeong is the popular kid, she's passive aggressive and all of her classmates are like her servants. she did bully some of them but most of all is that one poor girl whose parents worked hard to study her in a prestigious school where minjeong is.

she dislikes her and bullied her all the way, even the head of the school, the principal and the teachers are all bribed to cover up what is happening. until the poor girl was about to report it to the police, her family has a few issues in the police and she didn't want them to know that their goody-two-shoes minjeong is causing trouble in their school. the two girls met in the bridge that night, thinking that the poor girl would make a request not to make her life miserable as she has the evidence of minjeong harassing her fellow students.

but minjeong has other plans, she carried a knife in her hand. while the other was turning around, she had a chance to stab her and killed her right on the spot. when the girl is lifeless, she took the evidence and destroyed before dropping the dead girl's body to the river below. that night, only minjeong's butler knew about what she did and promised to keep it a secret between them.

a month later, minjeong thought she's free from the murder of her bullied classmate, someone called her and knew her secret. the caller used it to blackmail her if she didn't follow what he wanted her to do. instead he wanted her to go to the tudor manor and lived there or else he would expose her secret to her family and her reputation will shatter.

however, the butler didn't know it was not minjeong who killed the girl. the spoiled girl was diagnosed with disociative identity disorder, about a week ago when she was having weekly check up just before she went to the tudor manor. her alter ego is more deadlier than minjeong would ever be, she only wanted is for minjeong to stay as innocent as possible. would she be the culprit? we never know.