Mood: The mood of the video appears to be nostalgic and possibly humorous, given the title 'Woh 3 Din' which translates to 'Those 3 Days' in English. The theme seems to revolve around friendship, camaraderie, or a significant event from the past. The overall emotion evoked is one of reminiscence and possibly light-heartedness.

Environment: The setting appears to be outdoors, with a serene natural backdrop featuring mountains and a body of water, possibly a lake or river. The three men are sitting on a railway track, which adds an interesting contrast to the peaceful environment. The time of day seems to be either early morning or late evening, given the warm orange hues in the sky.