There are 4% of sociopath living on earth. So, how much percentage do you think it is to fall in love with one? Yoo-Jung is a sociopath, who looks perfectly normal, or maybe too ideally normal. Hong-Seol is a diligent over-achieving university student with keen senses. She feels that Yoo-Jung definitely does not like her, but can’t tell exactly why. However, all of a sudden, he starts to act nice. Not knowing why, Hong-Seol begins to feel attracted to him. As the time goes, she still can’t erase the feeling that something is wrong. Will their feelings for each other last?...