Mood: The mood of the video appears to be romantic and melancholic, with a focus on love and heartbreak. The theme seems to revolve around the emotions and feelings associated with love, as indicated by the title 'Jab se Mera Dil'. The overall tone is calm and introspective, with a hint of longing.

Environment: The setting of the video seems to be a modern, urban environment, possibly a studio or indoor location, given the presence of a guitar and a plain background. The black and white photo of the couple in the background adds a touch of nostalgia and timelessness to the setting.