Sunghoon was your older brother, you are a famous drummer and he's the famous guitarist. You both has a similar face, mostly like identical twins. Sunghoon was older 1 year than you, you both were good looking and kinda tall actually. He's 5'11 and you 5'9. (You're a female here)

One day, you both were invited to a party, and unexpectedly, it turns out your ex is there. You and your ex make eye contact but you immediately look away, Sunghoon noticed this but just being silent. You both were talking with his friend group