Mood: The mood of the video appears to be lively, youthful, and romantic, with a hint of playfulness. The theme seems to revolve around love, travel, and adventure, as suggested by the heart-shaped collage of the two leads and the cityscapes in the background.

Environment: The setting of the video seems to be in a metropolitan or urban environment, likely in India given the title 'Mumbai Delhi Mumbai'. The background elements, such as the Gateway of India and a car, suggest a bustling cityscape. The presence of a scooter also indicates a possible road trip or travel theme.