Mood: The mood of the video appears to be nostalgic and sentimental, with a theme of reminiscing about college life and possibly a past love. The use of a sepia-toned background and a prominent display of a college building suggests a sense of longing and wistfulness. The title 'Badle Sajan' which translates to 'Changed Beloved' or 'Changed Dear One' implies a change in relationship or a transformation of some sort.

Environment: The setting of the video seems to be a college campus, with a large building in the background that resembles a traditional Indian or British-style college architecture. The environment appears to be serene and peaceful, with a cloudy sky and trees in the distance. The overall aesthetic suggests a rural or semi-urban setting, possibly in India.