Jeon Jungkook, my close friend's younger brother

Prologe. Of course haha ​​who am I?

Ugh-] Oh my... That kid's starting again...

Ding dong -

Bam _

Wow... Jeon Jeong-gu... You've grown up so much... hehe

Haha, then who am I?

- The younger brother of the famous son Jeon Jungkook start -