He is afraid to talk to girls so he's always alone at training, he gets hight tempered or annoyed at his skating failures since he was on adolescence, he was at sixth grade and he's already turning 13

and you are an popular girl at ive skating, you have alot of friends except Sunghoon, but the secret is that he has a huge crush on you but he's too shy to talk with you. He's popular too since of his looks.