Mood: The mood of the video appears to be glamorous and playful, with a sense of mystery and intrigue. The theme seems to revolve around relationships, love, and possibly deception, given the title 'Do U Know' and the tagline 'Khel Khel Mein' which translates to 'In a Game'. The overall emotion conveyed is one of sophistication and allure.

Environment: The setting of the video seems to be a luxurious and modern lounge or nightclub, with a brick wall backdrop and a large framed picture. The presence of a couch and the attire of the individuals suggest a high-end social gathering or a photoshoot. The ambiance is lively and vibrant, with a hint of exclusivity.