She stared at him. "Are you dumb?"
[Dumb: temporarily unable or unwilling to speak]
Kai shook his head. "No, I can speak, I'm just not very good at it." he smiled sheepishly. "Tend to embarrass myself a lot."
Stupid? Ignorant? Attracting unwanted attention? Kai Waltz waltzed into a foreign life his superiors labeled "Case Deadpan". Prove you aren't a joke or die trying. All Kai has going are his good looks which, let's face it, cause more trouble than not.