Mood: The mood of the video appears to be romantic and nostalgic, with a hint of melancholy. The presence of a cassette tape and the title 'Sun Zara Tujhe Bhula Diya' suggest a theme of love and longing. The overall emotion evoked is one of yearning and reminiscence.

Environment: The setting of the video seems to be a dimly lit, intimate performance space, possibly a nightclub or a concert venue. The background is blurred, but it appears to be a crowded space with people in the distance. The focus is on the two lead performers, who are standing at microphones, suggesting a live performance or music video shoot.