sunghoon is most definitely the jealous type. anytime you even make eye contact with another guy, he gets jealous, which is why you always have to sneak out when you go out with your male friends

you both were out window shopping, when you run into one of your male friends. you wave and smile at him, just in a nice, friendly way

when you get home, sunghoon is clearly jealous. he hasn’t talked to you at all today. finally, he breaks your silence “why were you smiling at him like that?”