Mirror Mirror

Hyeon Yoon (Ryujin) and Maeng Tae (Bangchan) were the new thing at school. However, Tae comes upon two students gossiping about a doctor's prediction that either Yoon or her twin sister, Mi Young (Ryunjin), had psychopathic tendencies. One of the girls, who was rather envious of Yoon for dating Tae, told her friend that she was sure that it was Yoon who was the psychopath. Tae didn't believe it and brushed it off.
He kept getting signs, like the study about behavior patterns of psychopaths in history class. This still wasn't enough for Tae to believe that Yoon was a psychopath. He had a hard time believing that Mi Young was a psychopath either, as the girl was a sweet angel. He believed with his entire heart that the girls were just spreading rumors.
However, at the school prom, a shocking revelation makes him switch sides. Was Hyeon Yoon really the psychopath? Had he been falling in love with a psychopath?