Mood: The mood of this video appears to be energetic and intense, with a hint of rebelliousness. The theme seems to revolve around gang culture or street life, given the title 'Meeruthiya Gangsters'. The overall emotion conveyed is one of raw energy and possibly a bit of chaos.

Environment: The setting seems to be an indoor location, possibly a dimly lit or decorated room with a vibrant atmosphere, indicated by the presence of red balloons and a wall with diamond-shaped patterns in the background. The environment could be a nightclub, a party venue, or a hangout spot for the gang.