Mood: The mood of the video appears to be melancholic and introspective, with a sense of longing and yearning. The theme seems to revolve around a romantic relationship that may have been lost or unrequited, with the title 'KAASH Tu Mila Hota' suggesting a sense of regret and wistfulness.

Environment: The environment or setting of the video is not explicitly clear, but based on the images and text, it appears to be an urban or contemporary setting, possibly with a dark or muted color palette to match the melancholic mood. The presence of a couple in the background suggests a romantic or emotional setting.