Mood: The mood of the video appears to be melancholic and nostalgic, with a focus on heartbreak and longing. The use of black and white images and the title 'Breakup Mashup' suggest a somber and reflective tone. The theme of the video seems to revolve around the pain and emotions associated with a breakup, which is a common theme in Indian cinema.

Environment: The environment/setting of the video is not explicitly shown, but based on the images, it appears to be a mix of urban and rural settings, possibly in India. The images depict couples in various settings, such as outdoors, in cars, and in rooms, suggesting a variety of locations.