He almost says 'no.' Because he doesn't think he does. Except that's not quite true. Ryuuzaki had lost someone, someone so encompassingly important to him that it warped the rest of his life. And if certain individuals are to be believed... Tatsuo's own parents aren't actually alive. But how to explain all that?

Maybe it was best to go with the simple answer.

"No. I don't. And I can't imagine how that feels "