Jung Yoo-jung is a true crime enthusiast who decided that her life was so horrible that it would just be better if she simply took over the life of someone else. She did her research, found the right victim, and tried to do just that. She pretended to be a school girl to get access to a tutor who she then brutally killed, dismembered, and intended to body swap with. It sounds like the plot of a true crime show, but it's just the irrational actions of a very sick and disturbed individual.