Mood: The mood of the video appears to be energetic and romantic, with a hint of drama. The theme seems to revolve around love, relationships, and possibly the underworld, given the reference to 'Once Upon A Time In Mumbaai'. The overall emotion conveyed is one of passion and intensity.

Environment: The setting of the video seems to be a nightclub or a party scene, with flashing lights and a crowd of people in the background. The presence of a man in sunglasses and a suit jacket suggests a connection to the underworld or a luxurious lifestyle. The cityscape of Mumbai is also implied, given the reference to the movie title.