Mood: The mood of the video appears to be intense and dramatic, with the protagonist exuding a sense of determination and focus. The theme seems to revolve around crime and investigation, given the title 'HIT: The First Case'. The overall emotion conveyed is one of seriousness and grit.

Environment: The setting of the video seems to be a dimly lit, possibly indoor location with a blurred background that resembles a wall or a shutter. The presence of sweat on the protagonist's face suggests that the scene might be set in a high-stakes or action-packed environment.