Idol's 10-year best friend

prolog

김여주

Titititititititi Hello? Why?

디오

Hey, Yeoju, do you want to come to our concert? You really wanted to see Sehun.

김여주

So when?

디오

Next Saturday

김여주

Okay! See you then, bye

김여주

I'm Dio's girlfriend. We've been friends for 10 years!