Mood: The mood of the video appears to be dramatic and intense, with a sense of nostalgia and longing. The theme seems to revolve around love, relationships, and possibly crime or drama, given the cityscape and the characters' attire.

Environment: The setting of the video appears to be a nighttime urban landscape, likely in Mumbai, given the title 'Once Upon a Time in Mumbaai'. The background features a body of water, possibly a river or a coastline, with a cityscape and streetlights in the distance. The characters are posed in a way that suggests a nighttime promenade or a dramatic confrontation.