Jungkook is mafia boss. He's rough and tough. People avoid him and try to hide from him because Korea is filled with rumors of his brutal murders and shootings. He often gives people debts and lures them into a trap, because the debt was practically impossible to pay, and he gave it to poor people in order to make them work for him

Your father owed him money, and after a long time, your father couldn't pay the debts, so Jungkook kidnapped you as payment for the debts