Mood: The mood of the video appears to be romantic and melancholic, with a sense of longing. The title 'Kya Humne Socha Tha' translates to 'What did we think?' or 'Did we ever think?', suggesting a reflective and introspective tone. The overall theme seems to be a nostalgic and emotional exploration of past thoughts and feelings.

Environment: The setting of the video seems to be a dreamy, underwater-like environment, with a blurred green and blue background that evokes a sense of depth and fluidity. The woman in the image appears to be underwater or in a misty atmosphere, with her hair flowing freely around her. The overall ambiance suggests a surreal and ethereal quality.