For Kevin to be so intent on seeing him suffer, the only possible reason for such an enormous amount of hatred had to be because Kevin was the heir to the Lannister household.
This was Brian Stark's conclusion, and after hearing Kevin's response, he knew his assumptions hit the right mark.
A few moments of silence occurred right after Kevin answered Brian Stark's question.
Brian then sighed before opening his mouth to speak. "You do know that if I answer all your questions tonight, you will not leave this room alive, right?"
Brian Stark grabbed hold of the bottle of whiskey on his table and slid it towards Kevin.
But Kevin replied confidently. "Of course. Only one of us gets to leave this room alive." Kevin acknowledged with a smile while grabbing the bottle of whiskey and pouring himself a drink before gulping it down.
Brian Stark cackled at the words that came out of Kevin's mouth.