"At the brightest moment, I've become a monster!" this is how we can call the film, after the first grade of the strong bully school is hospitalized by drinking a herbicide drink found inside his closet, the second placed strong bully Yang-hoon takes its place. One day when Yang-hoon's harassment of his fellow student Jae-young strengthens, Yang-hoon orders Jae-young to closely follow a girl he calls Bo-young back to what he finds. Through this situation, Jae-young finds another girl who looks exactly like Bo-young named Yeri. I liked the characters, especially Lee Won-Geun and his psychopath character and his acting skills, as well as his target, Lee Won Geun playing an impeccable role as the tormented and intimidated teenager in general the theme is not new, but the acting is so good that the movie looks wonderful.