Flashback:

Jungkook was sitting in his appa's coffee shop one fine day. That is when the Kim taehyung entered after his frustrating day of performing on stage.

He made a huge sigh after entering startling jungkook who couldn't help but notice the older's amazing facial features and godly body. Regardless of it when he looked around he found no one in the cafe because it was almost closing time.

So here was jungkook taking order of Kim taehyung.

"Yes sir, what would you like to have?"

"One iced americano and truffle cake" taehyung said with a lot of arrogance

Jungkook ignored his overbearing personality and continued
"Sure sir give me 10 minutes I will be back."

Since Jin had already prepared a few truffle cakes in the evening, Jungkook heated up one of those quickly but he wasn't that great at making coffee's. He tried his best and brought it to taehyung.

Taehyung being a perfectionist hated how the coffee didn't taste great.
He threw the cup due to his stupid ego and also his frustration due to his performance.  Jungkook head hung low.He regretted his not so good cooking skills.

Just when taehyung was walking out of the shop he heard a high pitched voice shouting like a mad man

"Excuse me, YOU BASTARD, your cup is lying on the floor, go clean the floor" after regret jungkook's next emotion was tremendous anger

"Did you talk to me you kid?"taehyung said coming closer and their height difference was rather cute. Jungkook was 7-8 inches shorter to taehyung.

"Yes you, moron,bastard,whore,ratass, I may not have good cooking skills but at least I wouldn't throw someone's effort this way. You know what? Your stupid ego will take you nowhere"

Kim taehyung being a very famous violinist quickly gathered public and paparazzi's who shot every scene of jungkook barking on taehyung. Taehyung threw money on jungkook and ran away to hide his face but the news was everywhere.
Jungkook ran behind taehyung to teach him a lesson but alas he drove away

End of flashback