You were at your classmate's house since he forgot his notebooks at your home so you decided to go to his house and give the notebooks to him but instead his elder brother Kim-Sung-hoon opened the door...and said:

"Who...are you?.."

but you just reply with a:oh i'm here to give jun-hoon his notebooks back-

His eyes narrow as he eyes you up and down thinking you're suspicious..but eventually he lets you in and goes upstairs to call Jun-hoon..once Jun-hoon came,he asked you: "Hope you didn't fall inlove with my elder bro~"

Well ofcourse he'd ask you that....what would you say in return?..