Mood: The mood of the video appears to be romantic and introspective, with a sense of longing. The title 'Hua Hai Aaj Pehli Baar' translates to 'Happened for the First Time Today', suggesting a theme of new experiences, emotions, or love. The overall emotion evoked is one of nostalgia and sentimentalism.

Environment: The setting of the video seems to be a dimly lit or nighttime environment, with a dark background adorned with scattered white lights or stars, creating a dreamy and ethereal ambiance. The focus is on the singer, Prateek Walia, who is dressed casually, suggesting an intimate and personal setting.