Jay jo or Jo ja-hyun is cold hearted, emotionless expression,look boring but handsome good-looking, don't know how to talk to people,but carry if you're his friend,so smart and most smart students in school,have mullet hair black,black eyes,so kind but can't express it easily,not easy to feel in love,not scary he kind but boring and don't want to talk to people he don't know. He kind but don't show it. His face look cool expression. Cold hearted. Love study.love riding bicycle.