Mood: The mood of the video appears to be melancholic and introspective, with a hint of longing. The green tint and the title 'Kaise Kahein Alvida' suggest a sense of separation or goodbye. The theme seems to revolve around heartbreak, nostalgia, or a poignant moment in life.

Environment: The setting seems to be an outdoor location, possibly a bridge or a street, with a fence visible in the background. The presence of a man in a uniform and a child suggests a casual, everyday environment, but the green tint gives it a nostalgic or dreamlike quality.