Mood: The mood of the video appears to be romantic and melancholic, with a sense of longing. The theme seems to revolve around heartbreak or unrequited love, given the title 'Heartless' and the song title 'Main Dhoondne Ko Zamaane Mein Reprise', which translates to 'I've been searching for a lifetime'. The overall emotion conveyed is one of yearning and nostalgia.

Environment: The setting of the video seems to be a serene and peaceful environment, possibly near a body of water, given the blue hue at the bottom of the image resembling the ocean or a lake. The background is subtle, with the focus on the couple's emotional connection.