Who is EXO?

Who is EXO? Prologue

Hello.. I'm Yeoju Lee, the writer.. I'm an ordinary writer who is 27 years old.. There are other things besides being a writer, but I'll keep that.. a secret! Today, I was writing at home while composing a piece, and suddenly there was a ding-dong sound, so I stopped writing and went over to the intercom.

Ding dong-♬

"who are you?"

"Oh... I moved in next door yesterday and came to give you some rice cakes!"

"Yes, please wait a moment!"

Then I opened the door.
Squeak-

"Hello~haha"

"Ah.. hello~(wow.. pretty..)"

"Did you move in yesterday?"

"Yes... I moved in last night."

Ah... that's why it was so noisy yesterday...
Why is it so noisy?

"That's right! Here, have some rice cakes~ Now that we're neighbors, let's be friends^^"

"Thank you^^ But what is your name??"

"I'm Su.. no! My name is Kim Junmyeon~ My occupation is singer EXO~"

"Oh, right.. what did you just say??"

"EXO! Don't you know EXO??"

What?? What is EXO?? Are they eating??