[He seems a little caught off guard. He hadn't realized he was letting his mask slip that much. Then again though, he's tired and in pain, so he's had a lot more to focus on...

He glances away at first, staring at an oh so interesting building, then looks back at Shuichi. And then he sighs a little.]

Wellllll since I said I'd be honest, and you're not asking me about all of our deep, dark secrets...I guess I'm upset, yeah.

[Extremely so. "I guess I'm upset" is not even close to how he's feeling. But he's not that great at being honest, so it's the best the detective is going to get without prying for information.]