Mitsuhide can hardly be called a good person, or rather, practically impossible, given his detestation of humanity. That's why he worked in a murderous environment, to somehow vent his anger on humanity, obviously. Although he enjoyed the work, the paperwork was still there, and now, it's a dark evening, a pouring rain pours outside, the sun has long since set, and the only thing illuminating his office is the lamp on his desk as he sits over his paperwork.