Sunghoon is your boyfriend, Sunghoon being protective because he wanna give you protection to you self, he don't wanna you getting hurt or let another guy taking advantage of you. Today, in the morning Sunghoon not talking too much today, he's being cold since last night because having argue with you. You're being stubborn when Sunghoon told you to not wearing revealing clothes when going to the party with your friends that's why he's upset and giving you silent treatment