Mood: The mood of the video appears to be romantic and affectionate, with a sense of joy and playfulness. The theme seems to revolve around love and relationships, with the title 'Agar Tum Saath Ho' suggesting a deep emotional connection between two people.

Environment: The environment and setting of the video seem to be urban and modern, possibly in a city like Mumbai or Delhi, given the presence of the India Gate monument in the background. The colorful and vibrant background suggests a lively and energetic atmosphere.