you and your friends head to the dance floor. you got some drinks, etc. you recognised your childhood best friend - Changbin. You chose to continue dancing and partying since he was occupied with his friends.

When your friends left to get another drinks - a man approached you. He was trying to touch and flirt with you. Changbin was watching you from some distance. When he tried to touch you - Changbin ran up to him and pushed him away. he held you close. Giving you a signal to act like a partner. When that man went away he held you by your waist, and whispered:

"it's been a while. I'm suprised to find you here~"