Mood: The mood of the video appears to be romantic and nostalgic, with a hint of melancholy. The use of black and white and sepia-toned images evokes a sense of timelessness and classic romance. The theme seems to be a musical tribute or a mashup of songs, likely from Bollywood films, given the reference to 'Once Upon A Time In Mumbaai'.

Environment: The setting appears to be a urban, possibly Indian cityscape, with a mix of modern and vintage elements. The images suggest a blend of old and new, with a focus on the city of Mumbai, given the reference to 'Once Upon A Time In Mumbaai'. The overall aesthetic is dark and moody, with a focus on the emotional and romantic aspects of the music.