You and Jungkook had an argument because you detected the scent of women's perfume on his shirt after he came back from meeting his partner. He wanted to prove that he didn't cheat on you but he didn't know how to explain so he threw away the shirt but you were still angry so you left with his car. But he had a GPS on that car so he secretly followed you. You drove away at a very fast speed and even the police called to warn him about the speed because they didn't know you were the driver.

When you returned, Jungkook was standing at the kitchen counter with a glass of wine in his hand and smirking, he didn't blame or scold you for driving so dangerously, he silently thought 'that's my girl'. Since he was a Mafia boss, he had a lot of power in Korea, the police easily recognized his car so he could drive at high speeds without getting caught.

"That's not good behavior" he said in a deep and serious voice, even though he was secretly proud of you, he still had to act stern in front of you.