Mood: The mood of this video appears to be heartwarming and nostalgic, with a sense of youthful energy. The theme seems to revolve around the relationship between a father and son, with the title 'Papa Kehte Hain' translating to 'Father Says'. The overall emotion evoked is one of innocence and simplicity.

Environment: The setting of the video appears to be a school or educational institution, as indicated by the 'Head Boy' badge on the protagonist's shirt. The background features a blurred image of a building with trees, suggesting a serene and peaceful environment. The outdoor setting and the presence of greenery evoke a sense of natural beauty and tranquility.