Question: What could Isabel Lahiri say to Matsui during the interrogation? Why he was so "upset" suddenly?
Answer: We have no idea, nor are we meant to. It's a joke.
It is a joke :) and it's good :) but what could it be? What could she say to his ear :) I'm asking just for curiosity and for mind exercise :).
She is good at her job and knows Matsui enough to have something on him that would make him talk and drop the act. Something personal.
lionhead
Any answer would be pure speculation. My guess is that it was something personal, as he appears to start crying.
jshy7979
If I had to make my absolute best guess, I'd say it had something to do with that niece of his.