Mood: The mood of the video appears to be lively and celebratory, with a sense of joy and revelry. The theme seems to be related to a romantic comedy or a light-hearted film, given the title 'Happy Ending Song'. The overall emotion conveyed is upbeat and energetic, suggesting a feel-good experience.

Environment: The setting of the video seems to be a vibrant and colorful party or festival, possibly a Holi celebration given the background and the man's attire. The presence of a DJ setup suggests a lively music event or a club scene.