Hyunjin is your older brothers best friend since middle school, you always see him around but never really talked to him. You & him sometimes make eye contact but it rarely happens since his always busy with your brother

You're sitting on the couch in the living room watching your favorite show until you hear the doorbell ring, you stand up to answer it & when you open the door you see Hyunjin

"야, 네 동생은 집에 있니? 네가 문에 응답할 줄은 정말 몰랐는데..." He asks